This adjusts behavior of file module such that removal of se* option
does not revert the file's selinux context to the default. In order to
go back to the default context according to the policy, you can use the
context=default option.
This adds the options: seuser, serole, setype, and serange to the file
module. If the python selinux module doesn't exist, this will set
HAVE_SELINUX to False and punt in the related modules.
This takes the options the user provides and applies those to the
default selinux context as provided from matchpathcon(). If there is no
default context, this uses the value from the current context. This
implies that if you set the setype and later remove it, the file module
will rever the setype to the default if available.
