Add support for multiple signers.
Add support for multiple signers.

kbase/auth,PATRIC3/auth,kbase/auth,PATRIC3/auth,PATRIC3/auth,kbase/auth,olsonanl/kbauth,olsonanl/auth,olsonanl/auth,olsonanl/auth,olsonanl/kbauth,olsonanl/kbauth,olsonanl/kbauth,PATRIC3/auth,kbase/auth,kbase/auth,olsonanl/auth,olsonanl/kbauth,olsonanl/auth,PATRIC3/auth