The tags field may contain bad data before it is post_validated, however
some methods assumed it would be a simple list or string. Using itertools
gets us around the problem of the data potentially not being hashable

Fixes #9380

cloudstack: fixes and updates

change 'stage' to 'staging', as it a much more common term for a pre-…

fix typo in module-development comment: by -> but

change 'stage' to 'staging', as it a much more common term for a pre-production environment, and there are already many references to 'staging' appearing in the ansible code and docs, so let's be consistent

Starting to apply this for tags too, however it is not correcting things
as would be expected.

Getting recursive errors otherwise, so this is probably not something
we want to do. This most likely only worked in v1 due to the fact that
module args were templated earlier than the point in Runner() when
they were fed into the templating engine.

Add quote to a variable following a colon

docs - added missing filters

Update link to github in developing plugins docs

added six to install-from-source docs

Fixes #9235
Fixes #11184

Vendorize match_hostname code so that ansible can push it out to clients along with the code that uses it.

Using 'value is None' instead of 'not value', in order to account
for boolean values which may be false

Fixes #11232