Force saltenv to be a string when passed to state compiler
Load gitfs config values as strings
Load hgfs config values as strings
Load svnfs config values as strings
Don't try to use text_type to force saltenv to be unicode

This breaks salt code that uses raw string formatting (i.e. {0!r})
Merge pull request #16937 from terminalmage/issue16285

Force VCS fileserver backend config values to be loaded as strings