Bug 1191477 - Retry Android test job if unable to install an apk; r=kmoir

testing/mozharness/scripts/android_emulator_unittest.py

@@ -645,13 +645,13 @@ class AndroidEmulatorTest(BlobUploadMixin, TestingMixin, EmulatorMixin, VCSMixin
         # Install Fennec
         install_ok = self._retry(3, 30, self._install_fennec_apk, "Install Fennec APK")
         if not install_ok:
-            self.fatal('Failed to install %s on %s' % (self.installer_path, self.emulator["name"]))
+            self.fatal('INFRA-ERROR: Failed to install %s on %s' % (self.installer_path, self.emulator["name"]))
 
         # Install Robocop if required
         if self.test_suite.startswith('robocop'):
             install_ok = self._retry(3, 30, self._install_robocop_apk, "Install Robocop APK")
             if not install_ok:
-                self.fatal('Failed to install %s on %s' % (self.robocop_path, self.emulator["name"]))
+                self.fatal('INFRA-ERROR: Failed to install %s on %s' % (self.robocop_path, self.emulator["name"]))
 
         self.info("Finished installing apps for %s" % self.emulator["name"])