fix: we don't want the env name in the flavor

[cardoe]

We don't want to be prefixing the flavor names with an environment name. Just put the environment data in the correct place.

[skrobul]

ok so codewise the matching should work now, but where is the configuration that decides which flavor types to be used?

I assume we want to just mount the prod or nonprod into /etc/understack_flavors/, but that does not seem to be implemented yet:

• the enroll-server still mounts whole flavors directory which contains both prod and nonprod. This must be adjusted before merging.

• nova-flavors synchronizer that was recently merged will need to have that configuration too. The Deployment for it has not been merged yet, but it also needs a different path https://github.com/RSS-Engineering/undercloud-deploy/pull/224 was not merged so I made necessary adjustments and rebased.

[skrobul]

https://github.com/RSS-Engineering/undercloud-deploy/pull/245 adds the missing piece of setting the FLAVORS_DIR for both enroll-server and nova-flavors. With this, I think that PR makes more sense.