lvg module bugfix on vg_options patch

When no vg_options are passed to the module, 'vg_options' still exists
in the module.params dict with a value of None, so the default empty string in
the get method is never used. None cannot be "splitted", which backtraced.
ec2_asg module enhancements

  - Added a more verbose response
  - includes its settable attributes and a list of its instances.
  - allows setting of tags, changes upon which mark the task changed
  - allow getting of information from asg module, not just setting
  - doesn't mark changed if the parameter wasn't specified
  - Availability Zones are pulled from the region
Perform safe normalization of nics to use uuid
use different strategy for RHEL >= 7. Fixes 7763
Added missing fallback from physical_block_size to hw_sector_size in sectorsize fact discovery for kernels older than May 2009.

References #5761
unarchive: do not assume tar supports -C

Fixes #7777
(But don't rewrite the tar invocation in is_unarchived(), since a
tar that supports "--diff" certainly supports "-C" as well).
Merge pull request #7755 from sivel/rax-asg-normalize-nic

module rax_scaling_group: safe normalization of nics
Update tower.rst

Point to current URLs, fix a Ansible/Tower reference.
Merge pull request #7771 from jkramarz/issue-5761

Added missing fallback to hw_sector_size
Use file documentation fragement for the copy module
Merge pull request #7793 from wenottingham/patch-1

Update tower.rst
Allow executable to contain 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.
move get_distribution_version() to basic.py
Allow gem 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.
ascii should be ascii_letters
Numbers is not a string module
Merge pull request #7798 from koenpunt/npm-nvm-exec

Allow npm executable to contain spaces
Updates django_manage so it populates VIRTUAL_ENV

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.
Merge pull request #7801 from koenpunt/npm-rbenv-exec

Allow gem executable to contain spaces
Merge pull request #7802 from victorcoder/devel

Fixes password lookup docs