Branch for modifying the stack to accept qop either quoted or unquoted, but emit it only in the correct way (unquoted), while preserving the ability to parse/emit qop-options correctly (ie, quoted).

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-bwc-qop_interop_fix@6935 ddefafc4-47db-0310-ae44-fa13212b10f2
The qop fix, plus unit-test work.

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-bwc-qop_interop_fix@6936 ddefafc4-47db-0310-ae44-fa13212b10f2