Make flash messages module more version-agnostic
Multimethod dispatch on version
* Move ver_pick to utils.version module (and rename to just 'pick')
* Add version based dispatch to flash module as example
* Add copy of distutils' LooseVersion (except a new style class) for
  version dispatch
* Add a memoized decorator
* Supersedes #786
Add is_a dispatch for LooseVersion
* List new versions in cfme.versions
Added ip address caching too
Fix linear nav mouse move issue

In the navigation selenuim seems to move from point A to point B in a
linear vector. Consequently in the navigation if this vector passes over
another top level navigation menu, the top level will be selected and
the intended second level navigation item will become invisibile leading
to a failure. This fix opens the top level navigation and then drops to
the first second level element, before moving to the intended second
level element, effectively creating an L shape two step navigation,
instead of a straight diagonal vector.
Add fill func to form buttons
Fix Schema Crud tests

Link was showing up as 0x0px element, img is present and a better match.
Refactor infra/hosts to use web_ui.form_buttons
Merge pull request #823 from psav/fix_nav_issue

Fix linear nav mouse move issue
Merge pull request #821 from psav/net_port_cacher

Added ip address caching too
Switch from copypasta'd memoize to functools32's lru_cache
Merge branch 'master' into origin-pr-786

Conflicts:
	cfme/configure/about.py
	cfme/infrastructure/pxe.py
	cfme/services/catalogs/catalog.py
	cfme/web_ui/__init__.py
	cfme/web_ui/flash.py
	cfme/web_ui/tabstrip.py
Merge branch 'master' into origin-pr-786

Conflicts:
	cfme/fixtures/pytest_selenium.py
Fixed blocker_div, move_element related
Fix bad merge conflict resolution
Fix #831
prov_filter works with empty cfme_data
flake8 utils fixtures markers
base_url is now set properly in the subprocess worker

parallelized runs were all using the same appliance. woops. :)
Merge pull request #828 from psav/fix_blocker

Fixed blocker_div, move_element related