Add shell_plugins to abstract shell-specific functions out of runner, add winrm connection plugin, add initial Windows modules.

Fixes password lookup docs

Allow gem executable to contain spaces

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

[openbsd-pkg] Add note regarding package flavors

Fix in pkgutil: don't call pipes.quote() on None

unarchive: improve failure detection and reporting

Prevents a "not a legal parameter" error for play ds structures that
may be passed into the Play() constructor, which really is mainly a
concern during tests.

fix for repo urls like ssh://git@github.com/ansible/ansible.git

Fix task description

Removed duplicate entries (1.6.1-1.6.3) in changelog.

Related to #7777

In this function, 'site' may be None, which will cause an exception
if it is passed to pipes.quote().

This adds a note to the openbsd-pkg module which explains how to specify
package flavors as well as how to avoid ambiguity errors on a package
with multiple flavors.

Technically, this is not Ansible-specific, but it's pretty likely the
user will encounter this problem.

Added missing fallback from physical_block_size to hw_sector_size in sectorsize fact discovery for kernels older than May 2009.

References #5761