nova/flavors: Rename & alias flavors to g/c/m scheme
nova/flavors: Rename & alias flavors to g/c/m scheme

Rename all public, non-hana-used flavors to the new naming scheme and
add the old name(s) as "config:alias" extra_spec.

This effectively deprecates the old flavor names, however they will
still appear in `openstack flavor list` but with a `flavorid` starting
with `x_deprecated_`, and they will deploy as the new flavors. This
allows automation to continue using the old names for now.

sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts