Rename common to android

Rename the "common" package to "android", because common is too
generic.  Also removes all android.Android naming stutter.

Ran:
gomvpkg -from 'android/soong/common' -to 'android/soong/android'
gorename -from '"android/soong/android".AndroidModuleContext' -to 'ModuleContext'
gorename -from '"android/soong/android".AndroidBaseContext' -to 'BaseContext'
gorename -from '"android/soong/android".AndroidModuleBase' -to 'ModuleBase'
gorename -from '"android/soong/android".AndroidBottomUpMutatorContext' -to 'BottomUpMutatorContext'
gorename -from '"android/soong/android".AndroidTopDownMutatorContext' -to 'TopDownMutatorContext'
gorename -from '"android/soong/android".AndroidModule' -to 'Module'

Change-Id: I3b23590b8ce7c8a1ea1139411d84a53163288da7
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 1bb8fcd..5b0c83c 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -24,7 +24,7 @@
 
 	"android/soong"
 
-	"android/soong/common"
+	"android/soong/android"
 )
 
 func main() {
@@ -35,7 +35,7 @@
 
 	ctx := soong.NewContext()
 
-	configuration, err := common.NewConfig(srcDir, bootstrap.BuildDir)
+	configuration, err := android.NewConfig(srcDir, bootstrap.BuildDir)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "%s", err)
 		os.Exit(1)