The releaseutil package was originally designed to work against a
generated codebase from a protobuf in Helm v2. This is when Helm
used gRPC to communicate to a server side component named Tiller.
When Helm moved everything client side, this package remained and
it supported the release package.
This change moves releaseutil to be a sub-packge of release. This
is part of the change to support apiVersion v3 charts which is
documented in HIP 20
Signed-off-by: Matt Farina <matt.farina@suse.com>
