Add salt-formulas injection ability

Using new global variable SALT_FORMULAS_REFS now is possible
to change any salt-formula during deployment.

Use: export SALT_FORMULAS_REFS='kubernetes:refs/changes/xxx aodh:refs/changes/xxx'

DocImpact

Change-Id: Ic3e73bcd115e4c49bd4bde48c7e41f3a3a2d8309
Reviewed-on: https://review.gerrithub.io/373715
Reviewed-by: Dennis Dmitriev <dis.xcom@gmail.com>
Tested-by: Dennis Dmitriev <dis.xcom@gmail.com>
1 file changed