Bug 874729 - Part 2: Don't print extra logcats after running Robocop. r=jmaher

Before a Robocop test starts, |recordLogcat| clears the |adb logcat| on
device.  If a Robocop test fails, we print the logcat immediately after
the test.  The moved call avoids printing the logcat after all tests
have completed, which avoids printing a spurious second copy.  We still
print the logcat after running a Mochitest.

testing/mochitest/runtestsremote.py

@@ -804,8 +804,9 @@ def main():
                 pass
             retVal = 1
 
+        mochitest.printDeviceInfo(printLogcat=True)
+
     message_logger.finish()
-    mochitest.printDeviceInfo(printLogcat=True)
 
     sys.exit(retVal)