dev-db/pgbouncer: Bump and improve

dev-db/pgbouncer: Bump and improve

Added optional dep on OpenSSL.

Fixed logrotate script to always succeed.

Address potential DoS by letting s-s-d handle the pidfile creation and
backgrounding of pgbouncer.

Dropped restart in initscript as online restart can’t be used with
s-s-d and the pidfile isn’t writeable by the pgbouncer user.

Bug: https://bugs.gentoo.org/500546
Bug: https://bugs.gentoo.org/577784
Bug: https://bugs.gentoo.org/629334
Closes: https://bugs.gentoo.org/565218
Package-Manager: Portage-2.3.13, Repoman-2.3.3