Add versionadded for varnish module

Also did some cleanup and made it conform to the way Salt does things
Add varnish module to docs
Remove redundant function
Fix refs to removed function _detect_os()

Also convert some double-quotes to single-quotes and fix the purge
function. It was never running the command that it built, and it should
have been returning a boolean.
Documented absolute path changes to ssh_known_hosts.
Support Unicode output for grains.

Closes #12611
Remove tokens from master on a schedule

Closes #12911
Merge pull request #13182 from cachedout/12911

Remove tokens from master on a schedule
Return DNS information from boto_elb.get_elb_config
Fix docs for boto_route53 type -> record_type
updating to new raet changes
remove blank lines
add some logging.debug output to cp push
Merge pull request #13190 from Mutantjessica/develop

add some logging.debug output to cp push
Merge pull request #13188 from gtmanfred/develop

fix schedule spelling
Updated etcd_mod.py

Fixed documentation syntax for bash multiline examples.
Documentation fix in salt/states/postgres_database.py

Small typo fix in the documentation.
Merge pull request #13193 from shift/develop

Documentation fixes
Do not send reload modules event to minion loop when multithreaded.
Clarify GitPython installation in gitfs tutorial