Expose "db_timeout" for sqerl in Erchef, bifrost and mover.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Merge pull request #612 from opscode/kw/expose_sqerl_db_timeout

Expose "db_timeout" for sqerl in Erchef, bifrost and mover.