We have been caching the paths to the plugins but before we would only
cache the specific plugin that we were looking for.  This meant that we
might search through all of the plugin directories before finding the
specific module we were interested in.  The next plugin we needed we
might again search through all the plugin directories before finding the
plugin we wanted.

This new code will cache all the potential plugins in each directory
searched.  For a play that only uses one plugin we'll only search
through directories until we encounter the directory that has the proper
plugin.  For a large playbook with many plugins used we'll search
through each directory at most once each.

This should alleviate #10165

fix links to ansible-devel in documentation pages

Add tests for using .deb files

Add new rax_find_bootable_volume to assist with boot from volume

Fix wrong distribution facts on SLES/openSUSE

Fix umask calculation on file creation. Fixes #10257

Add `groups` back into inline templates

Added winrm/kerberos configuration information

valutpass fix in password reorg

improve yaml parsing performance by ~25% by using PyYAML's CParser loader

Document redis_kv Python package dependency

patch action plugin does not require dest

It's up to the module using the set_fs_attributes*/set_mode* methods to
specify the filename of the destination of the symlink if that's really
the file that should be modified.

Half of the fix for:
https://github.com/ansible/ansible-modules-core/issues/778

Mention in docs that the redis_kv lookup requires that the redis Python package
is installed.

Fixes #10243

Add how to load extra variables directly from a file (using @).

made sure passwords are strings

updated to correct to_bytes function
removed old to_bytes/to_unicode and repointed clients to new location
fixed unicode test

Fixed broken link.  Added links to both core and extras git repos.  

Typo in galaxy.rst