Rename PackageCacheOptions to PackageCache.

PackageCache refers to a historical implementation of Bazel, predating
Skyframe. Rename the options and fix names referring to the PackageCache.

RELNOTES: None.
PiperOrigin-RevId: 306265392
diff --git a/src/main/java/com/google/devtools/build/lib/pkgcache/PackageCacheOptions.java b/src/main/java/com/google/devtools/build/lib/pkgcache/PackageOptions.java
similarity index 98%
rename from src/main/java/com/google/devtools/build/lib/pkgcache/PackageCacheOptions.java
rename to src/main/java/com/google/devtools/build/lib/pkgcache/PackageOptions.java
index 2f86dc0..a233964 100644
--- a/src/main/java/com/google/devtools/build/lib/pkgcache/PackageCacheOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/pkgcache/PackageOptions.java
@@ -34,10 +34,8 @@
 import com.google.devtools.common.options.OptionsParsingException;
 import java.util.List;
 
-/**
- * Options for configuring the PackageCache.
- */
-public class PackageCacheOptions extends OptionsBase {
+/** Options for configuring Packages -- loading and default behaviors. */
+public class PackageOptions extends OptionsBase {
 
   /**
    * Converter for the {@code --default_visibility} option.