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
Add C. R. to AUTHORS file.
Merge remote branch 'upstream/develop' into develop
added a new tutorial based around bootstrap-salt
support user-defined chain in salt iptables moudle
support user-defined chain in salt iptables state module
Make sure that an iterable is available. Fixes #8556.
Document that Raven is a required dependency. Fixes #8557.
Gracefully handle certain bad yaml conf files.

Parsing a conf file as valid yaml might still yield something other than
a dictionary, which is required. So check for that case, log an error,
and continue the same way that an invalid yaml conf file would be handled.
Merge pull request #8492 from rca/salt_local_pillar_root_option

Added --pillar-root option
Merge pull request #8496 from duk3luk3/docfixes

Added warning about * default to cron docs
Don't try to access the default tenant id in user_list and user_get
Merge pull request #8505 from gravyboat/develop

Update to the iptables doc to explain set_policy is for default rules. Also a modification to the FAQ.
Merge pull request #8558 from s0undt3ch/issues/sentry-logging-fixes

sentry logging fixes
pylint fixes
Strip ALL non windows scripts from `sdist`.