Applications will mostly want to show names of features to their users,
and not just a few bits. With the FeatureSet functions it becomes simple
for applications to map the name of a feature to bits, and the other way
around
Signed-off-by: Niels de Vos <ndevos@redhat.com>
By splitting up the features from the main rbd.go file, it becomes
easier to support new features added by newer versions of Ceph.
This also drops the Rbd-prefix from the constants, and adds backwards
compatible references.
Signed-off-by: Niels de Vos <ndevos@redhat.com>