Allow users to provide additional projected volumes to be mounted into
the various deployments, statefulsets, and jobs that the ironic chart has
in the /etc/ironic/ironic.conf.d/ path. This allows for users to provide
service account or database secrets via different operators as well as
provide ways to use the chart to define common deployments while being
able to have site specific overrides.
Change-Id: Ic7b474fd0c99f15e0ed7e13a6da46e5c2a8fea0f
Signed-off-by: Mathieu Gagné <mgagne@calavera.ca>