container-puppet.sh: add -r to rm command
container-puppet.sh: add -r to rm command

When purging config files, it can happen that we try to remove a
directory. Example for the ironic_pxe container:

  rm: cannot remove ‘/var/lib/config-data/puppet-generated/ironic/etc/my.cnf.d/’: Is a directory

So just add -r to the rm command, so the purge can finish.

Depends-On: https://review.opendev.org/#/c/705757/
Change-Id: Ib821cfc95e4349b681c08ac86ad97b742c933983

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates