two macros GSSAPI_KRB5_INIT() or GSSAPI_KRB5_INIT_MS() which call
the former, check its return code and bail on error.
Addresses PR lib/19191
Given a quick look by joda@.
to store alternate creds, retrieved from a keytab. Make gss_init_sec_context
work with creds != GSS_C_NO_CREDENTIAL. Free ccache in id_t in release_cred.