Bug 891927 - [test-agent] the sinon sandbox is not always restored when it's used in the most outer suite's setup r=jlal
Merge pull request #10899 from julienw/891927-fixes-sinon-implementation

Bug 891927 - [test-agent] the sinon sandbox is not always restored when ...
Bug 891811 - [sms] tests: properly use sinon so that we have no side effects between suites r=gnarf

properly use sinon sandboxes for good restore
Bug 888150 - [MMS][Regression] Header actions are not working properly.

- STR1 Fixed
- STR2 Cannot Reproduce (https://www.dropbox.com/sh/3lr5a5kepnns8z1/rydxqmpucg)
- STR3 Fixed
- Fixes broken activity handling introduced here: https://github.com/mozilla-b2g/gaia/commit/8b41ee9a80c1d6b3613339e7388035d3fbcc575d#L2R227 includes tests.

https://bugzilla.mozilla.org/show_bug.cgi?id=888150
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>