Since c597d591b56a2a9ed355c57a717d1b2ed4c31aa9 the release script uses
acbuild instead of actool, so purge all the references and have the
release script check for acbuild's presence instead.
When using refresh, etcd store v2 watch is broken. Although with refresh
store should not trigger current watchers, it should still add events into
the watchhub to make a complete history. Current store fails to add the event
into the watchhub, which causes issues.
If the WAL is stored in a separate directory then the backup command
would need a --wal-dir option to pick the path to the WAL directory.
The user might also want to store the backup of data and wal separately
for which --backup-wal-dir option is provided.
