Make yum package installer silent

install_yum_packages.bash was generating output.
Change 2>&1 >/dev/null to &>/dev/null to completely
silence output.
Fix vagrant bootstrap to work first time

Move mason_cache mkdir and chown down to Apache section to ensure
Apache user exists.

Add setenforce Permissive command to SELinux section to allow Tusk to
run the first time. Otherwise generates the puzzling error in
tusk_base.conf that TUSK/Constants.pm can't be found, even though it
is clearly in the search path. Upon reboot this problem disappears.
The setenforce command fixes this problem for initial vagrant up.