Update how to set default selinux context for file
Update how to set default selinux context for file

This removes the 'context' option and replaces it with checks for
'_default' value for seuser, serole, setype, or (maybe) selevel.
If '_default' is provided *and* there is a default context for the given
file, this will set the file context to the available default.

thaim/ansible,thaim/ansible