cpp-common update
Merge pull request #78 from Metaswitch/cpp_update

[No reviewer] cpp-common update
Take latest cpp-common
Pull in latest cpp-common
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Update cpp-common
Add c-ares and curl to fix #75
Merge pull request #80 from Metaswitch/iss75

[Reviewer: Andy] Add c-ares and curl to fix #75
Added SNMP alarm support
Updates for SNMP alarm test coverage