RF: move exceptions used by both client and server into common/exceptions.py

this prevents importing of server while operating with client only

common/exceptions.py

@@ -0,0 +1,36 @@
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*-
+# vi: set ft=python sts=4 ts=4 sw=4 noet :
+"""Fail2Ban exceptions used by both client and server
+
+"""
+# This file is part of Fail2Ban.
+#
+# Fail2Ban is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# Fail2Ban is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Fail2Ban; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+__author__ = "Cyril Jaquier, Yaroslav Halchenko"
+__copyright__ = "Copyright (c) 2004 Cyril Jaquier, 2011-2012 Yaroslav Halchenko"
+__license__ = "GPL"
+
+#
+# Jails
+#
+class DuplicateJailException(Exception):
+	pass
+
+class UnknownJailException(Exception):
+	pass
+
+
+