Don't keep packages in the default repository around after loading.

Previously, this would get thrown when referring to the same package
from both the main and default repositories:
java.lang.IllegalArgumentException: Multiple entries with same key: tools/cpp=/home/brian/971-Robot-Code and tools/cpp=/home/brian/971-Robot-Code
	at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:136)
	at com.google.common.collect.RegularImmutableMap.checkNoConflictInKeyBucket(RegularImmutableMap.java:98)
	at com.google.common.collect.RegularImmutableMap.fromEntryArray(RegularImmutableMap.java:84)
	at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:295)
	at com.google.devtools.build.lib.buildtool.BuildTool.transformPackageRoots(BuildTool.java:301)
	at com.google.devtools.build.lib.buildtool.BuildTool.buildTargets(BuildTool.java:209)
	at com.google.devtools.build.lib.buildtool.BuildTool.processRequest(BuildTool.java:334)
	at com.google.devtools.build.lib.runtime.commands.TestCommand.doTest(TestCommand.java:119)
	at com.google.devtools.build.lib.runtime.commands.TestCommand.exec(TestCommand.java:104)
	at com.google.devtools.build.lib.runtime.BlazeCommandDispatcher.exec(BlazeCommandDispatcher.java:371)
	at com.google.devtools.build.lib.runtime.BlazeRuntime$3.exec(BlazeRuntime.java:1016)
	at com.google.devtools.build.lib.server.RPCService.executeRequest(RPCService.java:65)
	at com.google.devtools.build.lib.server.RPCServer.executeRequest(RPCServer.java:434)
	at com.google.devtools.build.lib.server.RPCServer.serve(RPCServer.java:229)
	at com.google.devtools.build.lib.runtime.BlazeRuntime.serverMain(BlazeRuntime.java:975)
	at com.google.devtools.build.lib.runtime.BlazeRuntime.main(BlazeRuntime.java:772)
	at com.google.devtools.build.lib.bazel.BazelMain.main(BazelMain.java:55)

And this would get thrown for any packages in the main repository loaded
from other repositories:
java.lang.RuntimeException: Unrecoverable error while evaluating node 'PACKAGE:@//tools/build_rules/go/toolchain' (requested by nodes )
	at com.google.devtools.build.skyframe.ParallelEvaluator$Evaluate.run(ParallelEvaluator.java:982)
	at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$WrappedRunnable.run(AbstractQueueVisitor.java:499)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Invalid BUILD file name for package '@//tools/build_rules/go/toolchain': /home/brian/bazel/tools/build_rules/go/toolchain/BUILD
	at com.google.devtools.build.lib.packages.Package.finishInit(Package.java:299)
	at com.google.devtools.build.lib.packages.Package$Builder.finishBuild(Package.java:1308)
	at com.google.devtools.build.lib.skyframe.PackageFunction.compute(PackageFunction.java:501)
	at com.google.devtools.build.skyframe.ParallelEvaluator$Evaluate.run(ParallelEvaluator.java:933)
	... 4 more

Sponsor's comment: note the abundance of new Label.resolveRepositoryRelative() calls. They are ugly, but it's only making existing ugliness explicit. Yes, we should fix it, especially in the implementation of configurable attributes.

Refs #940

--
Change-Id: I8bd7f7b00bec58a7157507595421bc50c81b404c
Reviewed-on: https://bazel-review.googlesource.com/#/c/2591
MOS_MIGRATED_REVID=117429733
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
index 3d7f77e..0476e56 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
@@ -82,7 +82,7 @@
   private ContainingPackageLookupValue lookupContainingPackage(String packageName)
       throws InterruptedException {
     SkyKey key =
-        ContainingPackageLookupValue.key(PackageIdentifier.createInDefaultRepo(packageName));
+        ContainingPackageLookupValue.key(PackageIdentifier.createInMainRepo(packageName));
     return driver
         .<ContainingPackageLookupValue>evaluate(
             ImmutableList.of(key),
@@ -103,7 +103,7 @@
     scratch.file("a/BUILD");
     ContainingPackageLookupValue value = lookupContainingPackage("a/b");
     assertTrue(value.hasContainingPackage());
-    assertEquals(PackageIdentifier.createInDefaultRepo("a"), value.getContainingPackageName());
+    assertEquals(PackageIdentifier.createInMainRepo("a"), value.getContainingPackageName());
     assertEquals(rootDirectory, value.getContainingPackageRoot());
   }
 
@@ -112,7 +112,7 @@
     scratch.file("a/b/BUILD");
     ContainingPackageLookupValue value = lookupContainingPackage("a/b");
     assertTrue(value.hasContainingPackage());
-    assertEquals(PackageIdentifier.createInDefaultRepo("a/b"), value.getContainingPackageName());
+    assertEquals(PackageIdentifier.createInMainRepo("a/b"), value.getContainingPackageName());
     assertEquals(rootDirectory, value.getContainingPackageRoot());
   }
 
@@ -122,11 +122,11 @@
     ContainingPackageLookupValue valueA2 = ContainingPackageLookupValue.NONE;
     ContainingPackageLookupValue valueB1 =
         ContainingPackageLookupValue.withContainingPackage(
-            PackageIdentifier.createInDefaultRepo("b"), rootDirectory);
+            PackageIdentifier.createInMainRepo("b"), rootDirectory);
     ContainingPackageLookupValue valueB2 =
         ContainingPackageLookupValue.withContainingPackage(
-            PackageIdentifier.createInDefaultRepo("b"), rootDirectory);
-    PackageIdentifier cFrag = PackageIdentifier.createInDefaultRepo("c");
+            PackageIdentifier.createInMainRepo("b"), rootDirectory);
+    PackageIdentifier cFrag = PackageIdentifier.createInMainRepo("c");
     ContainingPackageLookupValue valueC1 =
         ContainingPackageLookupValue.withContainingPackage(cFrag, rootDirectory);
     ContainingPackageLookupValue valueC2 =