Correction for #12800.

As pointed out by @whiteinge, test=True should result in result=None.
Fixed the descriptions of the methods as well.

This implementation now follows the logic of file.absent().
Add more requisites to STATE_INTERNAL_KEYWORDS.
Correct iptables rule parameter.

Is "of" stands for "out-interface"?
Merge pull request #12826 from zeezooz/iptables_out_interface

Correct iptables rule parameter.
Merge pull request #12822 from eliasp/rdp-2nd-fix

Correction for #12800.
Added debugging helper function to Jinja to dump available context
Merge pull request #12832 from whiteinge/salt-jinja-show-context

Added debugging helper function to Jinja to dump available context
Merge pull request #12824 from zeezooz/requisite_keywords

Add more requisites to STATE_INTERNAL_KEYWORDS.