Agent: remove the "is_monkey_alive_by_configuration" check

Should monkey be alive is now checked on island. Island checks both, the config and whether the user killed it manually

monkey/infection_monkey/monkey.py

@@ -128,10 +128,6 @@ class InfectionMonkey:
         logger.debug("default server set to: %s" % self._opts.server)
         return True
 
-    @staticmethod
-    def _is_monkey_alive_by_config():
-        return not WormConfiguration.alive
-
     @staticmethod
     def _is_upgrade_to_64_needed():
         return WindowsUpgrader.should_upgrade()