virnetsocket: pass XAUTORITY for ssh connection

When spawning an ssh connection, the environment variables
DISPLAY, SSH_ASKPASS, ... are passed. However XAUTHORITY,
which is necessary if the .Xauthority is in a non default
place, was not passed.

Signed-off-by: Christian Franke <nobody@nowhere.ws>

AUTHORS

@@ -209,6 +209,7 @@ Patches have also been contributed by:
   Srivatsa S. Bhat     <srivatsa.bhat@linux.vnet.ibm.com>
   Chang Liu            <lingjiao.lc@taobao.com>
   Lorin Hochstein      <lorin@isi.edu>
+  Christian Franke     <nobody@nowhere.ws>
 
   [....send patches to get your name here....]
 

src/rpc/virnetsocket.c

@@ -628,6 +628,7 @@ int virNetSocketNewConnectSSH(const char *nodename,
     virCommandAddEnvPass(cmd, "SSH_AUTH_SOCK");
     virCommandAddEnvPass(cmd, "SSH_ASKPASS");
     virCommandAddEnvPass(cmd, "DISPLAY");
+    virCommandAddEnvPass(cmd, "XAUTHORITY");
     virCommandClearCaps(cmd);
 
     if (service)