Bug 1517178 - [raptor] disable adb verbose output during logcat collection, r=rwood.

testing/raptor/raptor/raptor.py

@@ -484,7 +484,11 @@ class Raptor(object):
 
     def check_for_crashes(self):
         if self.config['app'] in ["geckoview", "fennec"]:
+            # Turn off verbose to prevent logcat from being inserted into the main log.
+            verbose = self.device._verbose
+            self.device._verbose = False
             logcat = self.device.get_logcat()
+            self.device._verbose = verbose
             if logcat:
                 if mozcrash.check_for_java_exception(logcat, "raptor"):
                     return