config: Changed key=$key to expand to first parser that changed it. This allows adding chained settings, like:
config: Changed key=$key to expand to first parser that changed it.
This allows adding chained settings, like:

key=foo
key=$key bar
key=$key baz

-> key=foo bar baz

--HG--
branch : HEAD

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot