Function krb5_sys::krb5_verify_init_creds

pub unsafe extern fn krb5_verify_init_creds(context: krb5_context,
                                            creds: *mut krb5_creds,
                                            server: krb5_principal,
                                            keytab: krb5_keytab,
                                            ccache: *mut krb5_ccache,
                                            options: *mut krb5_verify_init_creds_opt)
                                            -> krb5_error_code