[PATCH 3/4] get rid of offlineimap/syncmaster.py

[Łukasz Żarnowiecki]

> +                                   name = "Account sync %s" % accountname)

What about?

  name = "Account sync {}".format(accountname))

I know that most codebase is using printf style, but Python devs
recommend that and it is compatible both with Python 2 and 3.