Make unix socket world writable
Make unix socket world writable

Per the comment:

	Make world-writable so anything can connect and send logs.
	This may be be worth locking down more, but as-is unless
	pg_logplexcollector and the Postgres server share the same
	running user common umasks will be useless.

Signed-off-by: Daniel Farina <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@fdr.io>

heroku/pg_logplexcollector,logplex/pg_logplexcollector