Disable Python 2 variant, but keep sources filegroup.

The 'path' attribute affects the import path in Python. The change
that removed it, aosp/2221331, appears to have accidentally moved
the entire content of the module to httplib2.python3.httplib2.

Bug: 245854393
Test: presubmit
Change-Id: Ib518cb8668fc4c90e85f895d1cb45c1cffc8b42d

Android.bp

diff --git a/Android.bp b/Android.bp
index c77abc6..4cb6d72 100644
--- a/Android.bp
+++ b/Android.bp
@@ -57,12 +57,6 @@
 }
 
 filegroup {
-    name: "py2_httplib2_srcs",
-    srcs: ["python2/httplib2/*.py"],
-    path: "python2/httplib2",
-}
-
-filegroup {
     name: "py3_httplib2_srcs",
     srcs: ["python3/httplib2/*.py"],
     path: "python3/httplib2",
@@ -73,14 +67,5 @@
     host_supported: true,
     data: [":cacert_data"],
     pkg_path: "httplib2",
-    version: {
-          py2: {
-              enabled: true,
-              srcs: [":py2_httplib2_srcs"],
-          },
-          py3: {
-              enabled: true,
-              srcs: [":py3_httplib2_srcs"],
-          },
-    },
+    srcs: [":py3_httplib2_srcs"],
 }