mononoke/tests: disable mutation.record everywhere

Summary:
This is consistent with what is being done for now in hg for tests that haven't been migrated
to modern configurations yet, and ensures we get stable commit hashes in our tests: D21899139. It's already explicitly turned on on tests that want it.

In the future, this should probably be updated to use "modern configs" like the
Mercurial tests do.

Reviewed By: ikostia

Differential Revision: D22016705

fbshipit-source-id: b27f6423bf4ec5244ef3ce2e7676306165a331a8

eden/mononoke/tests/integration/library.sh

@@ -376,6 +376,8 @@ commitextras=
 ack=*
 [experimental]
 changegroup3=True
+[mutation]
+record=False
 EOF
 }
 
@@ -1191,6 +1193,8 @@ treeonly=True
 [remotefilelog]
 server=False
 reponame=repo
+[mutation]
+record=False
 EOF
 }