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

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https://hg.mozilla.org/integration/gaia-central/rev/bd86315ceb2d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13572 from AndreiH/bug936533

Bug 936533 - test_settings_bluetooth.py is failing, please fix

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https://hg.mozilla.org/integration/gaia-central/rev/142a38a50073
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 936533 - test_settings_bluetooth.py is failing, please fix

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6fbc3880dac71e0a819cb0449a16134a010808f4", 
+    "revision": "bd86315ceb2d5888e5f3967f3bfbc561c5307807", 
     "repo_path": "/integration/gaia-central"
 }