* Added valgrind memory leak tests in testmem.sh for restconf

* Added clicon_socket_set() and clicon_socket_get() functions for cleaning up backend server and restconf FCGI socket on termination.
* Removed obsolete `-x` command-line option to clixon_cli.

apps/netconf/netconf_main.c

@@ -283,6 +283,10 @@ send_hello(clicon_handle h,
     return retval;
 }
 
+/*! Clean and close all state of netconf process (but dont exit). 
+ * Cannot use h after this 
+ * @param[in]  h  Clixon handle
+ */
 static int
 netconf_terminate(clicon_handle h)
 {