cpp-common update
Merge pull request #98 from Metaswitch/cpp_update

[No reviewer]  cpp-common update
Use the Diameter Base Accounting application directly, without using the 3GPP Vendor-ID
Code review feedback
Merge remote-tracking branch 'origin/dev' into rf_acct_id

Conflicts:
	modules/cpp-common
Update cpp-common
Merge pull request #99 from Metaswitch/rf_acct_id

[Reviewer: Andy] Use the Diameter Base Accounting application directly, without using the...
Take latest cpp-common and sas-client
Change Metaswitch submodule refs to ClearwaterCore