Find the right server name when using basic auth
Find the right server name when using basic auth

When S4U2Proxy is used in combination with Basic Auth, the gss_inquire_cred()
call will return the client name instead of the server name we need.
Detect this case and aquire a separate set of credentials in that case.

Fixes #28

devurandom/mod_auth_gssapi,davisd123/mod_auth_gssapi,frenche/mod_auth_gssapi,frenche/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,davisd123/mod_auth_gssapi,frenche/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,devurandom/mod_auth_gssapi,uhd-urz/mod_auth_gssapi,devurandom/mod_auth_gssapi,frenche/mod_auth_gssapi,davisd123/mod_auth_gssapi