Defend against NULL _uas_tsx leading to Sprout crash
Merge pull request #642 from plfrancis/uas_tsx_crash

Defend against NULL _uas_tsx leading to Sprout crash
Use the new HttpStack 'controllers' API
Move chronos SAS logging utilities to httpstack_utils
Take latest cpp-common
Take latest cpp-common
Merge pull request #644 from Metaswitch/sto809

[Reviewer: Graeme][From: Alex] Sprout changes following HttpStack re-factor
Use the correct path to httpstack_utils.cpp
Merge pull request #647 from Metaswitch/st0809_code_coverage

[No review required] Use the correct path to httpstack_utils.cpp
Update cpp-common
Merge pull request #648 from Metaswitch/cpp_update

[No reviewer] Update cpp-common
Merge remote-tracking branch 'origin/master' into contact-filtering