Integrate with SAS-aware HTTP stack
Take latest cpp-common
Renumber SAS event IDs to new scheme
Add HTTP SAS event IDs
Remove SASEvent defintions (moved to cpp-common)
Take latest cpp-common
Integrate with HTTP connection that can SAS log at procotol or detail level
Log chronos HTTP flows at detail level
Take latest cpp-common
Add test that the HTTP correlation header is added to requests
Update cpp-common
Merge remote-tracking branch 'origin/master' into sas_integration
Take latest cpp-common
Add UUID correlation test
Move sas_write into cpp-common
Merge pull request #474 from Metaswitch/sas_write

[Reviewer: Ellie]  Move sas_write into cpp-common
Add BGCF events
Add S-CSCF selection events
Renumber event IDs
Add SIP resolver events