Added a function to grab the site-packages directory from a virtualenv
Allow salt modules to be refreshed on demand.

As an example for the above feature:

```yaml
python-pip:
  cmd:
    - run
    - cwd: /
    - name: easy_install --script-dir=/usr/bin -U pip virtualenv
    - reload_modules: true
```

See the last line?
If no exception occurs in this state, after it's execution, salt **will** reload it's modules.
Add documentation about explicit module reload on states.
Support creating disk volume via libvirt

Tested on VMware ESXi.

Note that a new configuration directive is introduced with this patch:

.. code-block:: yaml

    libvirt:
      storagepool: poolname
Merge branch 'develop' into libvirt-define-vol
Merge pull request #6858 from s0undt3ch/features/states-reload

Allow salt modules to be refreshed on demand.
Merge pull request #6860 from whiteinge/get_site_packages

Added a function to grab the site-packages directory from a virtualenv
Add virt.stop alias for virt.destroy

Analogous to virt.start vs virt.create.
Merge pull request #6863 from holmboe/libvirt-define-vol

Libvirt define vol
Merge pull request #6864 from holmboe/virt-stop

Add virt.stop alias for virt.destroy