available auth_methods must be reset on partial authentication
available auth_methods must be reset on partial authentication

Signed-off-by: Tilo Eckert <e61d7dc8debdc0f4239ace93fd966e0fe6f25a5f@flam.de>
Reviewed-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>
(cherry picked from commit cc25d747d45f139729f1728cc5dcbd1666709a4f)

mwgoldsmith/ssh,mwgoldsmith/ssh,Distrotech/libssh,Distrotech/libssh,mwgoldsmith/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,mwgoldsmith/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,Distrotech/libssh,Distrotech/libssh