Enable CI for formulas

We should have CI that check syntax for the states for avoiding syntax issues and manual testing.
https://github.com/SUSE/salt-formulas/pull/67 like

# howto

for reference  check:

https://github.com/SUSE/saphanabootstrap-formula/blob/master/ci/validate-formula.sh

https://github.com/SUSE/saphanabootstrap-formula/blob/master/.travis.yml