BUG #11014: Postgres can be put into an error state by setting invalid timezone.

The following bug has been logged on the website:

Bug reference:      11014
Logged by:          Duncan Gillis
Email address:      dgillis@dystillr.com
PostgreSQL version: 9.4beta1
Operating system:   Ubuntu 13.04; Ubuntu 14.04
Description:

psql (9.4beta1)
Type "help" for help.

postgres=#
postgres=#
postgres=# show timezone;
 TimeZone
----------
 UTC
(1 row)

postgres=#
postgres=#
postgres=# set timezone='-0400';
SET
postgres=#
postgres=# show timezone;
 TimeZone
----------
 unknown
(1 row)

postgres=# select now();
The connection to the server was lost. Attempting reset: Failed.
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