update cpp-common
Merge pull request #53 from Metaswitch/update_cpp

update cpp-common
cpp-common update
Merge pull request #54 from Metaswitch/mod_update

[No reviewer] cpp-common update
Add new chronos_diags script
Merge pull request #55 from Metaswitch/chronos_diags

[Reviewer: Alex] Add new chronos_diags script
Extra diags for when chronos hangs
Make extra_diags executable
Allow monit to run 2 commands when chronos hangs
Rename extra_diags to write_monit_restart_diags (to clarify this is not part of clearwater-diags-monitor)
Merge pull request #56 from Metaswitch/extra_diags

[Reviewer: Andy][From: Alex] Get useful diags when chronos hangs and is restarted by monit
Update clustering.md

Remove ports in cluster configuration
cpp-common update
Merge pull request #57 from Metaswitch/cpp_update

[No reviewer] cpp-common update
Correct homepage
Update Location header to use a relative URL
Merge pull request #58 from Metaswitch/Location_header

[Reviewer: Andy] Update Location header to use a relative URL
Take latest cpp-common
Use threadpool for handling callbacks
Update UTs