promise/plugin: check_file_state configurability

Allow to configure result_count and failure_amount.

slapos/promise/plugin/check_file_state.py

@@ -10,6 +10,8 @@ class RunPromise(GenericPromise):
     super(RunPromise, self).__init__(config)
     # SR can set custom periodicity
     self.setPeriodicity(float(self.getConfig('frequency', 2)))
+    self.result_count = int(self.getConfig('result_count', '1'))
+    self.failure_amount = int(self.getConfig('failure_amount', '1'))
 
   def sense(self):
     """
@@ -56,4 +58,5 @@ class RunPromise(GenericPromise):
       self.logger.info("OK %r state %r" % (filename, state))
 
   def anomaly(self):
-    return self._anomaly(result_count=1, failure_amount=1)
+    return self._anomaly(
+      result_count=self.result_count, failure_amount=self.failure_amount)