awgtpman: client interface will now detect and use older RPC interfaces

Version 4.0.1 and earlier had 4 testpoint interfaces instead of two. This code autodetects which interfaces are used by awg and switches to the appropriate interface

This is needed to close an issue in cds-crtools.

src/gds/awgtpman/testpoint.c

@@ -1105,5 +1105,7 @@ int testAwgTpInterfaceVersion(int node)
         printf("found version 4 or newer test point interface\n");
         node_version[node] = 4;
     }
+
+    clnt_destroy (clnt);
     return node_version[node];
 }
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