Handle defaults for Socket differently

We want to be able to select the default for Socket differently in the
future.

This change augments the API for dkimpy_milter.util.own_socketfile()
by adding an optional sockname argument.  This is a
backward-compatible change.  If we aren't committed to API stability
for this function, we could make a more invasive change that would
probably be a more reasonable API going forward, but this is probably
good enough.

dkimpy_milter/__init__.py

@@ -354,7 +354,9 @@ def main():
     Milter.set_flags(Milter.CHGHDRS + Milter.ADDHDRS)
     miltername = 'dkimpy-filter'
     socketname = milterconfig.get('Socket')
-    own_socketfile(milterconfig)
+    if socketname is None:
+        socketname = 'local:/var/run/dkimpy-milter/dkimpy-milter.sock'
+    own_socketfile(milterconfig, socketname)
     drop_privileges(milterconfig)
     sys.stdout.flush()
     Milter.runmilter(miltername, socketname, 240)

dkimpy_milter/config.py

@@ -39,7 +39,7 @@ defaultConfigData = {
     'SyslogFacility': 'mail',
     'UMask': 0o07,
     'Mode': 'sv',
-    'Socket': 'local:/var/run/dkimpy-milter/dkimpy-milter.sock',
+    'Socket': None,
     'PidFile': '/var/run/dkimpy-milter/dkimpy-milter.pid',
     'UserID': 'dkimpy-milter',
     'Canonicalization': 'relaxed/simple',

dkimpy_milter/util.py

@@ -146,12 +146,15 @@ def write_pid(milterconfig):
     return pid
 
 
-def own_socketfile(milterconfig):
+def own_socketfile(milterconfig, sockname=None):
     """If socket is Unix socket, chown to UserID before dropping privileges"""
     import os
     user, group = user_group(milterconfig.get('UserID'))
     offset = None
-    sockname = milterconfig.get('Socket')
+    if sockname is None:
+        sockname = milterconfig.get('Socket')
+    if sockname is None:
+        return
     if sockname[:1] == '/':
         offset = 0
     elif sockname[:6] == "local:":