Update configuration.rst with new config variables.
Update configuration.rst with new config variables.

TrimBiggs/calico,neiljerram/felix,matthewdupre/felix,ocadotechnology/calico,beddari/calico,anortef/calico,TrimBiggs/calico,kasisnu/calico,neiljerram/felix,Metaswitch/calico,kasisnu/calico,neiljerram/felix,alexhersh/calico,anortef/calico,Metaswitch/calico,matthewdupre/felix,beddari/calico,ocadotechnology/calico,neiljerram/felix,alexhersh/calico