Allow unbanip of tuple IDs

As specified [here], IDs in Fail2ban can be tuples. However, when a
tuple ID is banned, there is no way to remove it via the `unbanip`
command line. If tried, the tuple will be considered as a list with each
element being an ID. Instead, we should try to parse the string to see
if it represents an object.

[here]: 226a59445a/fail2ban/server/failregex.py (L313)

fail2ban/server/actions.py

@@ -274,6 +274,13 @@ class Actions(JailThread, Mapping):
 			if missed:
 				raise ValueError("not banned: %r" % missed)
 			return cnt
+		# IPs can be represented in string format (e.g.: tuples)
+		is_ip_parsed = True
+		if isinstance(ip, str):
+			try:
+				ip = eval(ip)
+			except Exception:
+				is_ip_parsed = False
 		# Single IP:
 		# Always delete ip from database (also if currently not banned)
 		if db and self._jail.database is not None:
@@ -285,14 +292,14 @@ class Actions(JailThread, Mapping):
 			self.__unBan(ticket)
 		else:
 			# Multiple IPs by subnet or dns:
-			if not isinstance(ip, IPAddr):
+			if not is_ip_parsed and not isinstance(ip, IPAddr):
 				ipa = IPAddr(ip)
 				if not ipa.isSingle: # subnet (mask/cidr) or raw (may be dns/hostname):
 					ips = list(filter(ipa.contains, self.banManager.getBanList()))
 					if ips:
 						return self.removeBannedIP(ips, db, ifexists)
 			# not found:
-			msg = "%s is not banned" % ip
+			msg = "%s is not banned" % str(ip)
 			logSys.log(logging.MSG, msg)
 			if ifexists:
 				return 0