Update cpp-common
Add ralf-libs-dbg as dependency of ralf-dbg
Merge pull request #53 from Metaswitch/fix-up-dependencies

Reviewer Matt - Add ralf-libs-dbg as dependency of ralf-dbg
Update cpp-common
Add log cleanup scripts
Correct access log prefix
Take latest cpp-common
Merge pull request #56 from Metaswitch/update-cpp-common

[No review required] Take latest cpp-common
Merge pull request #55 from Metaswitch/log_cleanup

[Reviewer: Alex] Add log cleanup scripts