Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/894a7f2886a7
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #16545 from asutherland/fixtest-pop3-badpwd

Bug 975298 - [email/backend] intermittent GELAM test failure for POP3 in test_account_bad_password_error. r=mcav

========

https://hg.mozilla.org/integration/gaia-central/rev/8167afbf7c9c
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 975298 - [email/backend] intermittent GELAM test failure for POP3 in test_account_bad_password_error. r=mcav

Land the results of the GELAM fix from
https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/285
into gaia.  The test fix involved adding additional logging and we want
/ need that logging propagated.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "df0b1e4b8e67fecbfd2dcb47903e2d5143cb60bf", 
+    "revision": "894a7f2886a7a727ce03edadbbea936ceb4aaeba", 
     "repo_path": "/integration/gaia-central"
 }