UITest: Actually time-out the wait

Without that, if XDesktop::terminate() fails (e.g., because an assert in
a test was false while a modal dialog was open, which left the dialog
open, and so TerminationVetoException was thrown in XDesktop::terminate()
by a listener), the wait never ends, and the assertion message gets lost
when buildbot terminates the build, as happened in
https://ci.libreoffice.org/job/gerrit_linux_clang_dbgutil/51496/console.

The timeout only available since python 3.3.

The soffice process is not terminated in this case; hopefully it will be
terminated when build cleanup will occur.

Change-Id: I924775d0e58619d1fbd603e80ed1f8d047c91145
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87362
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

uitest/libreoffice/connection.py

@@ -9,6 +9,7 @@ import subprocess
 import time
 import uuid
 import os
+import sys
 
 try:
     import pyuno
@@ -130,10 +131,17 @@ class OfficeConnection:
             else:
                 self.soffice.terminate()
 
-            ret = self.soffice.wait()
-            self.xContext = None
-            self.socket = None
-            self.soffice = None
+
+            try:
+                if sys.version_info >= (3,3):
+                    ret = self.soffice.wait(30) # will throw when timed out
+                else:
+                    ret = self.soffice.wait() # no timeout in python that old
+            finally:
+                self.xContext = None
+                self.socket = None
+                self.soffice = None
+
             if ret != 0:
                 raise Exception("Exit status indicates failure: " + str(ret))