apex respects stem of java_library modules

apex now respects stem of java_library modules.

As a follow-up we need to suppor the same for other types of modules.

Bug: 157638999
Test: m
Change-Id: Iaf5023020b5440f1ffd4f5414b5a7864655fc22a
diff --git a/java/java.go b/java/java.go
index 466132e..032aee6 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1878,7 +1878,7 @@
 			extraInstallDeps = j.InstallMixin(ctx, j.outputFile)
 		}
 		j.installFile = ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
-			ctx.ModuleName()+".jar", j.outputFile, extraInstallDeps...)
+			j.Stem()+".jar", j.outputFile, extraInstallDeps...)
 	}
 
 	// Verify Dist.Tag is set to a supported output
@@ -2728,7 +2728,7 @@
 	j.maybeStrippedDexJarFile = dexOutputFile
 
 	ctx.InstallFile(android.PathForModuleInstall(ctx, "framework"),
-		ctx.ModuleName()+".jar", dexOutputFile)
+		j.Stem()+".jar", dexOutputFile)
 }
 
 func (j *DexImport) DexJar() android.Path {