[sr-dev] [kamailio/kamailio] registrar: fix xavp_rcd memory consumption (#1111)

[lazedo]

@miconda more info

it seems that the `faked_env( t, 0, 1);` call (restore original environent) will discard the avps xavps that can be added during processing of the script block. in this use case,  registrar save (which calls reply) is called, which creates the xavps that are not being released.

from t_suspend.c
```
		faked_env( t, faked_req, 1);

		route_type_bk = get_route_type();
		set_route_type(FAILURE_ROUTE);
		/* execute the pre/post -script callbacks based on original route block */
		if (exec_pre_script_cb(faked_req, cb_type)>0) {
			if (run_top_route(route, faked_req, 0)<0)
				LM_ERR("failure inside run_top_route\n");
			exec_post_script_cb(faked_req, cb_type);
		}
		set_route_type(route_type_bk);

		/* TODO: save_msg_lumps should clone the lumps to shm mem */

		/* restore original environment */
		faked_env( t, 0, 1);
```


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