Added salt-unity manpages

Closes #13937
Fix the `.format()` call indexes
Merge pull request #15778 from whiteinge/doc-salt-unity-manpage

Added salt-unity manpages
Merge pull request #15782 from s0undt3ch/hotfix/2014.7-gce-fix-format-calls

Fix the `.format()` call indexes
Disable `test_issue_10404_ptys_not_released`

Disabled until we can find out why this kills the tests suite with an exit code of 134
Merge pull request #15794 from s0undt3ch/hotfix/disable-problematic-vt-test

Disable `test_issue_10404_ptys_not_released`
fix typo in docstring

s/direcotry/directory/
Merge pull request #15798 from bbinet/patch-1

fix typo in docstring
Add skipIf import to fix the 2014.7 tests
Merge pull request #15804 from rallytime/fix_import

Add skipIf import to fix the 2014.7 tests