Fix message leak
Merge dev in to issue779
Merge pull request #788 from Metaswitch/issue779

[Reviewer Andy] Message leak in I-CSCF retry failure case
Don't install configuration files as part of package install
Back-out erroneous submodule change
Merge pull request #790 from Metaswitch/issue514

[Reviewer Andy] Don't install configuration files as part of package install
Change Metaswitch submodule refs to ClearwaterCore