Remove RUBYOPT env variable hack from execute
Remove RUBYOPT env variable hack from execute

This was included a long time ago to make developing hooks easier.
However, it's hacky, but more importantly it interferes with Travis CI
runs since it kills the existing bundler context, resulting in issues
like:

    /home/travis/.rvm/rubies/ruby-1.9.3-p551/lib/ruby/site_ruby/
    1.9.1/rubygems/dependency.rb:315:in `to_specs': Could not find
    'bundler' (>= 0) among 42 total gem(s) (Gem::LoadError)

Remove it to fix this issue.

Change-Id: Id1b8181def00026ee0b6857614c31d576f9243fd
Reviewed-on: http://gerrit.causes.com/46974
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@brigade.com>
Reviewed-by: Shane da Silva <67fb7bfe39f841b16a1f86d3928acc568d12c716@brigade.com>

oxocode/overcommit,TheSooth/overcommit,gnagel/overcommit,oxocode/overcommit,blech75/overcommit,TheSooth/overcommit,blech75/overcommit,gnagel/overcommit