Refactor factories

Change module factories from returning a blueprint.Module and a list
of property structs to returning an android.Module, which holds the
list of property structs.

Test: build.ninja identical except for Factory: comment lines
Change-Id: Ica1d823f009db812c518f271a386fbff39c9766f
diff --git a/python/python_test.go b/python/python_test.go
index bb407e4..57aaa34 100644
--- a/python/python_test.go
+++ b/python/python_test.go
@@ -313,8 +313,10 @@
 		t.Run(d.desc, func(t *testing.T) {
 			ctx := blueprint.NewContext()
 			android.RegisterTestMutators(ctx)
-			ctx.RegisterModuleType("python_library_host", PythonLibraryHostFactory)
-			ctx.RegisterModuleType("python_binary_host", PythonBinaryHostFactory)
+			ctx.RegisterModuleType("python_library_host",
+				android.ModuleFactoryAdaptor(PythonLibraryHostFactory))
+			ctx.RegisterModuleType("python_binary_host",
+				android.ModuleFactoryAdaptor(PythonBinaryHostFactory))
 			ctx.MockFileSystem(d.mockFiles)
 			_, testErrs := ctx.ParseBlueprintsFiles(bpFile)
 			fail(t, testErrs)