Remove install_resolv_conf from dib puppet script
Remove install_resolv_conf from dib puppet script

This parameter is used for the unbound class, but we moved that class
out of openstack_project::template class and started managing unbound
here in the project-config dib elements, so we don't need to keep using
it and leaving it unset will not change any behavior.

Change-Id: I2ed1610dbfdc131943c64745e79da75133bf6818

openstack-infra/project-config,openstack-infra/project-config