Fixes #7828

Fixes #7760

Fixes #7812

Merge branch 'unarchive-fix-7777-simple' of https://github.com/toddmowen/ansible into toddmowen-unarchive-fix-7777-simple

The new CentOS 7 beta lists the distribution as "CentOS Linux", which
breaks the distribution detection and class loading. This patch fixes
that by taking just the first entry in the string when a space is
detected.

Fixed typo in docs

Merge branch 'lvg_fix' of https://github.com/sergevanginderachter/ansible into sergevanginderachter-lvg_fix

Merge pull request #7814 from scottbrown/bugfix-7811-mysql_import_does_not_perform_dump_existence_check

BUGFIX for Issue 7811: Adding file existence check when performing mysql import on...

Set default vg_options to empty string

Updates django_manage so it populates VIRTUAL_ENV

BUGFIX 1178: Adding better existence check in one place.  db_import now fails fast if target does not exist b/c no point going further without the target.

Building Ansible deb requires setuptools

BUGFIX 7811: Adding file existence check when performing mysql import on a .gz or .bz2 file, otherwise Ansible will not notice that the underlying *nix command silently died.

Fixes password lookup docs

Allow gem executable to contain spaces

Virtualenv's activate script sets the VIRTUAL_ENV environment variable to the path of the virtualenv. Checking this variable is a reasonably common way to verify that execution is happening in a virtualenv. It would be convenient if this module's virtualenv handling set this environment variable.

Allow npm executable to contain spaces

rbenv has a special exec function which loads the correct ruby version before executing a command.
The syntax for this is `/usr/local/rbenv/bin/rbenv exec gem ...` for example.
But previously when specifying executable='/usr/local/rbenv/bin/rbenv exec gem' this would not work because the string was treated as one executable. This PR fixes that by splitting the executable on spaces.

NVM has a special script which loads the correct node version before executing a command.
The syntax for this is `/usr/local/nvm/nvm-exec ...`, so `nvm-exec npm list --json` for example.
But previously when specifying `executable='/usr/local/nvm/nvm-exec nvm'` this would not work because the string was treated as one executable.

Update tower.rst

Added missing fallback to hw_sector_size

Point to current URLs, fix a Ansible/Tower reference.

module rax_scaling_group: safe normalization of nics