Removed disabling SELinux prereq; no longer needed

This SELinux problem was caused by the yumpkg.py module that used the
yum Python interface for CentOS 6 machines. That was removed in favor of
the yumpkg.py that shells out to yum which does not have this problem.
This workaround can be removed.
Add name declaration to database creation in database.sls
Merge pull request #17 from Drachemann/master

Add name declaration to database creation in database.sls
Merge pull request #13 from saltstack-formulas/remove-selinux-prereq

Removed disabling SELinux prereq; no longer needed