Reenable "selinux: Enforcing"

this works together with
http://gerrit.vanir.co:8080/#/c/1955/
and
http://gerrit.vanir.co:8080/#/c/1953/

because this two commits fix remaining selinux issues.

This reverts commit cc806d4e32d3f334b90931203a231d52f31b3321.

Change-Id: Idbb1484f3b77f243d6b5032d1263bd6204f50f91