Deprecations in authentication

Since Simon stirred up a hornets nest suggesting deprecation of a
number of features, I figured I'd take it one step further and suggest
removal of some previously deprecated features :)

In particular, we made a couple of changes over sveral releases back
in the authentication config, that we should perhaps consider
finishing by removing the old stuff now?

1. krb5 authentication. We've had gssapi since 8.3 (which means in all
supported versions). krb5 has been deprecated, also since 8.3. Time to
remove it?

2. ident-over-unix-sockets was renamed to "peer" in 9.1, with the old
syntax deprecated but still mapping to the new one. Has it been there
long enough that we should start throwing an error for ident on unix?


-- Magnus HaganderMe: http://www.hagander.net/Work: http://www.redpill-linpro.com/