ceph-volume: systemd: move the exceptions to the new exception module

Signed-off-by: Alfredo Deza <adeza@redhat.com>

src/ceph-volume/ceph_volume/main.py

@@ -72,6 +72,7 @@ Log Path: {log_path}
 
     @catches()
     def main(self, argv):
+        # XXX Port the CLI args to user arparse
         options = [['--log', '--logging']]
         parser = Transport(argv, mapper=self.mapper,
                            options=options, check_help=False,

src/ceph-volume/ceph_volume/systemd.py

@@ -6,24 +6,14 @@ as arguments to this script so that it can parse the suffix into arguments that
 
 import sys
 import logging
-from ceph_volume import log
-from ceph_volume import process
+from ceph_volume import log, process
+from ceph_volume.exceptions import SuffixParsingError
+
 
 log.setup(name='ceph-volume-systemd.log')
 logger = logging.getLogger('systemd')
 
 
-class SuffixParsingError(SystemExit):
-
-    def __init__(self, suffix, part=None):
-        self.suffix = suffix
-        self.part = part
-        SystemExit.__init__(self, self.__str__())
-
-    def __str__(self):
-        return 'Unable to parse the %s from systemd suffix: %s' % (self.part, self.suffix)
-
-
 def parse_subcommand(string):
     subcommand = string.rsplit('-', 1)[-1]
     if not subcommand: