remove rosters accidentally (EJAB-549). New functions in
ejabberd_auth to get/check password and know which module accepted
the authentication. New element 'auth_module' in ejabberd_c2s
record 'statedata'. Cyrsasl provides a new property in the
response: {auth_module, AuthModule}.
* src/ejabberd_auth_anonymous.erl: Likewise
* src/ejabberd_c2s.erl: Likewise
* src/cyrsasl_anonymous.erl: Likewise
* src/cyrsasl_digest.erl: Likewise
* src/cyrsasl_plain.erl: Likewise
SVN Revision: 1297
