fix sporadic test-cases fails: change debug transmitter-message (sometimes confused with expected "Server ready" of server), better syntax for internal subst _use_flush;

fail2ban/server/transmitter.py

@@ -116,7 +116,7 @@ class Transmitter:
 		elif command[0] == "echo":
 			return command[1:]
 		elif command[0] == "server-status":
-			logSys.debug("Server ready")
+			logSys.debug("Status: ready")
 			return "Server ready"
 		elif command[0] == "sleep":
 			value = command[1]

fail2ban/tests/fail2banclienttestcase.py

@@ -805,7 +805,7 @@ class Fail2banServerTest(Fail2banClientServerBase):
 				"norestored = %(_exec_once)s",
 				"restore = ",
 				"info = ",
-				"_use_flush_ = echo [<name>] <actname>: -- flushing IPs",
+				"_use_flush_ = echo '[%(name)s] %(actname)s: -- flushing IPs'",
 				"actionstart =  echo '[%(name)s] %(actname)s: ** start'", start,
 				"actionreload = echo '[%(name)s] %(actname)s: .. reload'", reload,
 				"actionban =    echo '[%(name)s] %(actname)s: ++ ban <ip> %(restore)s%(info)s'", ban,