[master] Add timeout parameter to lxc.stop

[gregorg]

What does this PR do?

Add parameter timeout to lxc.stop module.

[welcome]

Hi there! Welcome to the Salt Community! Thank you for making your first contribution. We have a lengthy process for issues and PRs. Someone from the Core Team will follow up as soon as possible. In the meantime, here’s some information that may help as you continue your Salt journey.
Please be sure to review our Code of Conduct. Also, check out some of our community resources including:

• Community Wiki
• Salt’s Contributor Guide
• Join our Community Slack
• IRC on LiberaChat
• Salt Project YouTube channel
• Salt Project Twitch channel

There are lots of ways to get involved in our community. Every month, there are around a dozen opportunities to meet with other contributors and the Salt Core team and collaborate in real time. The best way to keep track is by subscribing to the Salt Community Events Calendar.
If you have additional questions, email us at saltproject@vmware.com. We’re glad you’ve joined our community and look forward to doing awesome things with you!

[dwoz]

This needs a changelog entry and preferably a test too.

[dwoz]

@gregorg pre-commit is now failing.

[gregorg]

This needs a changelog entry and preferably a test too.

Done.

[twangboy]

This module and its associated states and tests have been transitioned to community support and are no longer maintained by the Salt Core team. The code has been removed from the Salt code-base and can be found in this repository: https://github.com/salt-extensions/community-extensions-holding/

There is currently discussion and work being done on the salt-extensions Discord channel (https://discordapp.com/channels/1200072194781368340/1208165123240370197) to document and build the infrastructure for community-supported salt extensions. There is also a Salt-Extensions Working Group that takes place on the 1st and 3rd Thursday of every month to coordinate salt-extension efforts.