repro: sample config: disable CommonNameMappings by default

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10052 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: log an error if mappings file missing

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10053 ddefafc4-47db-0310-ae44-fa13212b10f2