add package provider documentation
Merge pull request #3569 from archtaku/docs

add package provider documentation
Catch `ValueError` when trying to raise the max open files setting. Fixes #1991.

Under some occasions, the current default of 100000 max open files setting is too high. Properly catch that exception and warn the users about it.
See https://github.com/saltstack/salt/issues/1991#issuecomment-13025595
Make comment reflect reality

freebsd_sysctl "Only run on Linux systems" ? I think not.
Replace hard-coded links w/relative ":mod:" links
Merge pull request #3572 from archtaku/docs

Replace hard-coded links w/relative ":mod:" links
Merge pull request #3571 from viq/patch-2

Make comment reflect reality
Merge pull request #3570 from s0undt3ch/develop

Catch `ValueError` when trying to raise the max open files setting. Refs #1991
Switch overtstate system to use yaml.safe_load
Merge remote-tracking branch 'salt/develop'