Call envy directly
Call envy directly

This is what pushy_util:get_env/3 , /4 do, and those are deprecated.

Also replaced the explicit function arguments with their Envy symbolic
equivalents as a work-around for the broken type-spec in envy
(addressed by https://github.com/manderson26/envy/pull/6).

MSch/opscode-pushy-server,chef/opscode-pushy-server,chef/opscode-pushy-server,chef/opscode-pushy-server,MSch/opscode-pushy-server