…m/selinux.sls.

- This change will remove dependecy from linux/system/repo.sls in linux/system/selinux.sls.
- It also change structure from pillars selinux

old:
linux:
  system:
    ...
    selinux: permissive

new:
linux:
  system:
    ...
    selinux:
      pkgs: ['policycoreutils', 'policycoreutils-python'],
      mode: permissive

- We will check now if pillar system.selinux is a map for new format
- If system.selinux is not a map use old format
- policycoreutils and policycoreutils-python are not nessasary for basic selinux configuration
  we need this packages later to add selinux rules.
- Added new format to test pillars