Add SNMP alarm support to release-58
Incorporate review comments
Merge pull request #109 from ClearwaterCore/snmp-alarms-58

SNMP Alarms Release-58
Pull in latest cpp-common with alarm changes
Update freeDiameter
Cope with update to HttpStack API
Update submodule refs
Merge pull request #113 from Metaswitch/http_flows_in_sas

[Reviewer: Mike] Cope with update to HttpStack API
Take latest sas-client
Take latest cpp-common
Take latest cpp-common
Take latest cpp-common
Take latest cpp-common