Bug 1256300 - Add timeout to mozharness urllib2.urlopen call; r=jlund

testing/mozharness/mozharness/mozilla/testing/testbase.py

@@ -196,11 +196,10 @@ class TestingMixin(VirtualenvMixin, BuildbotMixin, ResourceMonitoringMixin,
             # Check if the URL exists. If not, use none to allow mozcrash to auto-check for symbols
             try:
                 if symbols_url:
-                    self._urlopen(symbols_url)
+                    self._urlopen(symbols_url, timeout=120)
                     self.symbols_url = symbols_url
-            except urllib2.URLError:
-                self.warning("Can't figure out symbols_url from installer_url: %s!" %
-                             self.installer_url)
+            except (urllib2.URLError, socket.error, socket.timeout):
+                self.exception("Can't figure out symbols_url from installer_url: %s!" % self.installer_url, level=WARNING)
 
         # If no symbols URL can be determined let minidump_stackwalk query the symbols.
         # As of now this only works for Nightly and release builds.