Rename BootImageModule to BootclasspathFragmentModule

Also renames files, tests, module types in a similar fashion.

There are still some references to image and boot image. They are kept
for the following reasons:
* image_name - this is the name of an ART boot image, i.e. the
  collection of .art/.oat/.vdex files.
* BootImageInfo - again this is related to the ART boot image.
* .../art_boot_images/... paths - ditto.

Bug: 177892522
Test: m nothing
Change-Id: Ie1f4738061d131fee75de48bc26a7601481bad4d
diff --git a/java/testing.go b/java/testing.go
index e9cdddc..649d27b 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -233,7 +233,7 @@
 	RegisterAppImportBuildComponents(ctx)
 	RegisterAppSetBuildComponents(ctx)
 	registerBootclasspathBuildComponents(ctx)
-	RegisterBootImageBuildComponents(ctx)
+	registerBootclasspathFragmentBuildComponents(ctx)
 	RegisterDexpreoptBootJarsComponents(ctx)
 	RegisterDocsBuildComponents(ctx)
 	RegisterGenRuleBuildComponents(ctx)