Update cpp-common
Fix UTs
Take lastest sas-client and cpp-common
Disable sas-client compression
Take latest cpp-common and freeDiameter
Merge remote-tracking branch 'origin/master' into diameter-sas-logging
Merge pull request #161 from Metaswitch/diameter-sas-logging

[Reviewer: Matt] SAS logging from freeDiameter
Take latest cpp-common
Compress IFC SAS events
Take latest cpp-common
Merge pull request #162 from Metaswitch/ifc-sas-compression

[Reviewer: Andy] Compress IFC SAS events