Added --pillar-root option

Complement to --file-root option added in
abc240f7ba006f35d7f5463db54ba2aefcdde106
Added warning about * default to cron docs
quick fix to the iptables docs to show that set_policy is for the default rule on a chain
updated FAQ.
updated to faq file to reword backwards compatibility
guilty unless proven innocent
Disable external auth sources for now
Cover auth cases where cloud only had a fun and no mod
Merge pull request #8538 from s0undt3ch/develop

Better `exec()` detection. Avoids esky build `NameError`.
Add link to 0.17.2 windows installers
Merge pull request #8541 from UtahDave/develop

Add link to 0.17.2 windows installers
Fix eauth track (made a list preperatory for external eauth data)
Add missing import
fix pylint error
Merge pull request #8544 from UtahDave/develop

Fix pylint errors
Add cloud runner to wrap the cloud api in the runner platform

This instantly makes salt cloud available to things like the reactor
Add C. R. to AUTHORS file.
Merge remote branch 'upstream/develop' into develop
added a new tutorial based around bootstrap-salt
Minor spelling fix

s/is not know'/is not known'/