pexpect: Don't try to get matches from TIMEOUT

If we match TIMEOUT then trying to retrieve the matches will throw an
exception, and also can't give us any useful information, so skip it.

Author: mpe

lib/pexpect_utils.py

@@ -71,7 +71,10 @@ def expect(self, patterns, timeout=-1, bug_patterns=None):
         patterns.extend(bug_patterns)
 
         idx = self.child.expect(patterns, timeout=timeout)
-        logging.debug("Matched: '%s' %s", self.get_match(), self.matches())
+        if self.child.match == pexpect.TIMEOUT:
+            logging.debug("Timed out looking for a match")
+        else:
+            logging.debug("Matched: '%s' %s", self.get_match(), self.matches())
 
         if idx >= len(patterns) - len(bug_patterns):
             self.drain_and_terminate(self.child, "Error: saw oops/warning etc. while expecting")