SCRAM optional parameter parsing bugfix

The server gave an authentication error, if optional parameters
were present in the GS2 Header. Specifically, the "a=" parameter,
that can be used by admins to login as a different user.
Include actor element in MUC stanzas when kicking (thanks to Purvesh Sahoo)(EJAB-1206)
Revert "Include actor element in MUC stanzas when kicking (thanks to Purvesh Sahoo)(EJAB-1206)"

This reverts commit 066c47ca96e09411b21df0c8e590a7de32a1e6a5.