[SSI] Temporarily removes cleanup from ServiceClientSide destructor

Code commented out until XRootD bug #775 is fixed.

xrootd-ssi-protobuf-interface @ b9293774

-Subproject commit bcbccfa667693ed0420c2eb69017a75f71fccbba
+Subproject commit b92937743ef5f2eaf1e30336519c0e7ee055e6b2