Make service and monitor permissions checks optional

MaxScale shouldn't require the service and monitor user checks. It makes
sense to disable the checks to speed up the startup process when the user
knows that the permissions are OK.

server/include/maxconfig.h

@@ -121,6 +121,7 @@ typedef struct
     unsigned int  auth_conn_timeout;                   /**< Connection timeout for the user authentication */
     unsigned int  auth_read_timeout;                   /**< Read timeout for the user authentication */
     unsigned int  auth_write_timeout;                  /**< Write timeout for the user authentication */
+    bool          skip_permission_checks;              /**< Skip service and monitor permission checks */
     char          qc_name[PATH_MAX];                   /**< The name of the query classifier to load */
     char*         qc_args;                             /**< Arguments for the query classifier */
 } GATEWAY_CONF;