tests: require revlog store for test-verify.t

This tests is doing tons of revlog-y things. It should be
possible to make verification work across multiple stores. But it
will likely have to wait until we have better abstractions
in place.

Differential Revision: https://phab.mercurial-scm.org/D3108

tests/test-verify.t

@@ -1,3 +1,5 b''
+#require reporevlogstore
+
 prepare repo
 
   $ hg init a