Update index.rst

Adding some copy edits. Feel free to disregard.

Display a warning when using a deprecated module

open_url() is suitable for use outside of a module environment.  Will
let us use open_url to do SSL cert verification in other, non-module
code.

Require passlib over crypt in password_hash for Mac OS X/Darwin. Fixes #11244

i was almost done with my patch ... but I like yours better

Update guide_gce.rst

Make the docs more specific.

now with_times: barestring, will error out in test

brought back terms testing as with_ is not only way to call and we cannot guarantee terms is a list otherwise.

Fixes #11235

comment to ec2.ini inventory instances grouping 

Re-introduce ssh connection private key support

changelog: add cs_network

Warning about usage boto+ec2.ini

this way we don't need a break per distro that matched already with
the python default functions

- now obeys global undefined var setting and allows override (mostly for with_ )
- moved environment instanciation to init instead of each template call
- removed hardcoded template token matching and now use actually configured tokens, now it won't break if someone changes default configs in ansible.cfg
- made reenetrant template calls now pass the same data it got, dictionary and lists were loosing existing and new params
- moved fail_on_undeinfed parameter to template call, as it should only realky be set to false on specific templates and not globally
- added overrides, which will allow template to implement jinja2 header override features
- added filter list to overrides to disallow possibly insecure ones, TODO: check if this is still needed as facts should not be templated anymore
- TODO: actually implement jinja2 header overrides

made sure it does not fail on undefined

added playbook path lookup

simplified function, always attempt to template, always check if string before return, should avoid most cases of strings being passed to lookups

Part fix for https://github.com/ansible/ansible-modules-core/issues/1404 (replaces #11086)

Update playbooks_vault.rst

As of 1.9 at least, you may specify a password file in your ansible.cfg and not have to extend your playbook calls with vault flags.

cloudstack: cleanup, remove unused parts