[#104] Add mask/unmask for services

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>

src/frostfs_testlib/hosting/interfaces.py

@@ -118,6 +118,26 @@ class Host(ABC):
             service_name: Name of the service to stop.
         """
 
+    @abstractmethod
+    def mask_service(self, service_name: str) -> None:
+        """Prevent the service from start by any activity by masking it.
+
+        The service must be hosted on this host.
+
+        Args:
+            service_name: Name of the service to mask.
+        """
+
+    @abstractmethod
+    def unmask_service(self, service_name: str) -> None:
+        """Allow the service to start by any activity by unmasking it.
+
+        The service must be hosted on this host.
+
+        Args:
+            service_name: Name of the service to unmask.
+        """
+
     @abstractmethod
     def restart_service(self, service_name: str) -> None:
         """Restarts the service with specified name and waits until it starts.