Ensure user-land configured symfony-env is used in console task

[peterjmit]

This copies strategy in
https://github.com/capistrano/rails/blob/master/lib/capistrano/tasks/set_rails_env.rake

Fix for issue #8 (github)

[peterjmit]

@patrickli thanks for your input - I missed adding with symfony_env: fetch(:symfony_env) (before we were using default_env).

default_env was good because then we were covered for composer commands. Command map is also an option, I would like to keep it simple though!

[patrickli]

I have been looking at a solution to this. With some initial testing, it seems removing the line

fetch(:default_env).merge!(symfony_env: fetch(:symfony_env))

from lib/capistrano/symfony/defaults.rb and implement it as a before task on deploy:starting is the best way to go.