Update the log module from oslo-incubator

Contains fix to stop the logger system from logging events twice.

Also includes PID in default logging_context_format_string

Fixes bug: 1170049

Change-Id: I007786604138c41fbcf1127c01339132c56a6aab
Merge "Update the log module from oslo-incubator"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp