Add ability to install rbenv independently

- Can now install rbenv separately. Can be used as a requirement in a
  state for installing rbenv plugins using the git or file states
Fix description of method and whitespace lost
Add event function to state runner for light event interaction via CLI
salt.cloud.lxc: Optimized salt client
Safebelts for lxc provisionning:

Cloud:
    - Allow to use alternate config prefixes
    - Filter default options

LXC module:
    - Filter default options in create
Report errors when preparation fails

Previously salt daemons could fail to start without giving any
reason, when (for example) chown failed during the startup.
This change doesn't fix anything, but at least reports the error
back to the user.
salt.states.archive: multiple improvments

- add a new keep paramater to optionnaly not delete the archive after extraction
- Fix the traceback in case of tar error by correctly returning a state return mapping
- Correctly handle extra tar options if any by adding defauts ones if only needed
- Pep8
- When silently extracting with tar, be sure that the no output stuff won't be
  handled as a failed extraction.
Add normalize_name function

This will pave the way for .x86_64 architectures to be used in pkg
states.
Normalize package names
Normalize package names
Normalize name for single package target
Merge pull request #11075 from terminalmage/issue7306

Allow for pkgname.x86_64 to be used in pkg states
Initial additional of module to manage nftables firewall rules.
Merge pull request #11078 from garethgreenaway/develop

Initial addition of module to manage nftables firewall rules.
Add pip_exists_action argument to virtualenv state

If you have some editable packages in a managed virtualenv than
you should be able to set the default action of pip for existing
paths.
lxc: saltify -> bootstrap; lxc & seed: doc improvements
salt.modules.seed: typo
utils/serializers/yaml.py: fix spelling: polute => pollute
Merge pull request #11081 from cvrebert/patch-1

utils/serializers/yaml.py: fix spelling: polute => pollute
[salt.cloud] adding volumes to cloud states