Add virtualenv_site_packages param to easy_install
Easy_install and pip module support a virtualenv_command parameter.

This allows flexible selection of the Python version to use while
creating the virtualenv.
Merge pull request #2150 from jhoekx/venv-command

Venv command
Added test cases for lineinfile.
Using the _get_test and _get_stage methods.
mark when various new flags were added to the pip & easy_install modules