Bug 756440 - Only warn when we fail cleanup steps with mobile mochitest/reftest;r=jmaher

Before we were outright failing if the test logfile was missing when cleaning
up these tests. But that's generally a sign that the app failed to start
up properly, which is the true issue we should be trying to catch / diagnose.
Let's just print a warning here and move on.

layout/tools/reftest/remotereftest.py

@@ -347,12 +347,12 @@ user_pref("capability.principal.codebase.p2.id", "http://%s:%s");
 
     def cleanup(self, profileDir):
         # Pull results back from device
-        if (self.remoteLogFile):
-            try:
-                self._devicemanager.getFile(self.remoteLogFile, self.localLogName)
-            except:
-                print "ERROR: We were not able to retrieve the info from %s" % self.remoteLogFile
-                sys.exit(5)
+        if self.remoteLogFile and \
+                self._devicemanager.fileExists(self.remoteLogFile):
+            self._devicemanager.getFile(self.remoteLogFile, self.localLogName)
+        else:
+            print "WARNING: Unable to retrieve log file (%s) from remote " \
+                "device" % self.remoteLogFile
         self._devicemanager.removeDir(self.remoteProfile)
         self._devicemanager.removeDir(self.remoteTestRoot)
         RefTest.cleanup(self, profileDir)

testing/mochitest/runtestsremote.py

@@ -202,8 +202,12 @@ class MochiRemote(Mochitest):
         self.localLog = options.logFile
 
     def cleanup(self, manifest, options):
-        self._dm.getFile(self.remoteLog, self.localLog)
-        self._dm.removeFile(self.remoteLog)
+        if self._dm.fileExists(self.remoteLog):
+            self._dm.getFile(self.remoteLog, self.localLog)
+            self._dm.removeFile(self.remoteLog)
+        else:
+            print "WARNING: Unable to retrieve log file (%s) from remote " \
+                "device" % self.remoteLog
         self._dm.removeDir(self.remoteProfile)
 
         if (options.pidFile != ""):