Disable failing unit tests
Bug 965168 - [Contacts] Export contacts to SD card is not working
Merge pull request #15791 from gregorwagner/disable

Bug 965083 - Disable failing unit tests for a green tbpl.
Merge pull request #15799 from gtorodelvalle/contacts-bug-965168-exporting-to-sd

Bug 965168 - [Contacts] Export contacts to SD card is not working
Bug 963716 - Bump gaiatest version to 0.21.4 and release to PyPI