virttest/virt_admin.py: Provide better Error Msg

-- The Issue
	To ensure the virt-admin interactive shell
	is alive, a "uri" command is executed

	However, the output of this command is
	ignored.

	This makes debugging a failure of this
	command hard.

-- The Fix
	Print the output of the error

Signed-off-by: Slancaster1 <[email protected]>

virttest/virt_admin.py

@@ -209,13 +209,14 @@ def __init__(
 
         # fail if libvirtd is not running
         if check_libvirtd:
-            if self.cmd_status("uri", timeout=60) != 0:
+            status, out = self.cmd_status_output("uri", timeout=60)
+            if status != 0:
                 LOG.debug(
                     "Persistent virt-admin session is not responding, "
                     "libvirtd may be dead."
                 )
                 self.auto_close = True
-                raise aexpect.ShellStatusError(virtadmin_exec, "uri")
+                raise aexpect.ShellStatusError(virtadmin_exec, out)
 
     def cmd_status_output(
         self, cmd, timeout=60, internal_timeout=None, print_func=None, safe=False