promise/plugin: check_file_state shall fail fast

This promise relates to resources local on the partition, which are files, and
they shall be available fast, thus make it failing immediately in case of
failure.

slapos/promise/plugin/check_file_state.py

@@ -53,4 +53,4 @@ class RunPromise(GenericPromise):
       self.logger.info("OK %r state %r" % (filename, state))
 
   def anomaly(self):
-    return self._anomaly(result_count=3, failure_amount=3)
+    return self._anomaly(result_count=1, failure_amount=1)