Remove tuple unpacking from except clause ipa-client/ipaclient/ipachangeconf.py

Python 3 doesn't support tuple unpacking in except clauses. All implicit
tuple unpackings have been replaced with explicit unpacking of e.args.

https://fedorahosted.org/freeipa/ticket/5120

Reviewed-By: Tomas Babej <tbabej@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipa-client/ipaclient/ipachangeconf.py

@@ -31,13 +31,13 @@ def openLocked(filename, perms):
         fd = os.open(filename, os.O_RDWR | os.O_CREAT, perms)
 
         fcntl.lockf(fd, fcntl.LOCK_EX)
-    except OSError, (errno, strerr):
+    except OSError as e:
         if fd != -1:
             try:
                 os.close(fd)
             except OSError:
                 pass
-        raise IOError(errno, strerr)
+        raise IOError(e.errno, e.strerror)
     return os.fdopen(fd, "r+")