Add the repository name as a parameter to the output path functions

This doesn't do anything yet, it's in preparation for the execroot rearranging
change.  The execroot will have one bazel-out per repo, so it'll look like:

execroot/
  repo1/
    bazel-out/
      local-fastbuild/
        bin/
  repo2/
    bazel-out/
      local-fastbuild/
        bin/
        genfiles/
  repo3/
    bazel-out/
      local-fastbuild/
        testlogs/

and so on. Thus, any output path (getBinDirectory() & friends) needs to know
what the repo name is. This changes so many places in the code I thought it
would be good to do separately, then just flip the functionality in the
execroot-rearranging commit.

While I was poking around, I changed all of the refs I could from getPackageRelativeArtifact() to getBin/GenfilesArtifact(), so that 1) rule implementation don't have to know as much about roots and 2) they'll be more isolated from other output dir changes.

`bazel info` and similar just return roots for the main repository.

The only "change" is passing around a target label in the Java rules.

Continues work on #1262.

--
MOS_MIGRATED_REVID=129985336
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/PseudoAction.java b/src/main/java/com/google/devtools/build/lib/analysis/PseudoAction.java
index e0eb712..eb2115a 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/PseudoAction.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/PseudoAction.java
@@ -84,6 +84,7 @@
   public static Artifact getDummyOutput(RuleContext ruleContext) {
     return ruleContext.getPackageRelativeArtifact(
         ruleContext.getLabel().getName() + ".extra_action_dummy",
-        ruleContext.getConfiguration().getGenfilesDirectory());
+        ruleContext.getConfiguration().getGenfilesDirectory(
+            ruleContext.getRule().getRepository()));
   }
 }