add buck option to allow selectively disable test for CI

Summary: add buck option to allow selectively disable test

Reviewed By: andrewjcg

Differential Revision: D7360106

fbshipit-source-id: 78db5c6b01e2c71be0f3b723bf55cf12354ddedd

hphp/test/DEFS

@@ -9,6 +9,16 @@ def verify_unittest(suite, repo, dir, mode='interp,jit',
                     cli_server=0, hhcodegen=False, use_hackc=False,
                     hhas_roundtrip=False, target_suffix='',
                     extra_args=[], blacklist=None):
+
+  # hphp_skip_repo_test and hphp_skip_non_repo_test let us enable or disable
+  # tests based on repo mode. This is useful to shard our tests into different
+  # sets for CI runs.
+  if repo and read_config('fbcode', 'hphp_skip_repo_test'):
+      return
+
+  if not repo and read_config('fbcode', 'hphp_skip_non_repo_test'):
+      return
+
   target_name = 'verify_' + suite + '_' + mode + \
        ('_repo' if repo else '') + \
        ('_relocate' if relocate else '') + \