Correct ringbuilder's set_weight usage string
Correct ringbuilder's set_weight usage string

The large version of the set_weight usage is missing the
new weight value. This has lead to confusion on the mailing
list.

This patch adds a <new_weight> option to not only add the
missing argument but also to make the command more clear
by differentiate between the search weight (--weight) and
how to set the new.

Change-Id: I7a4c5a6a4438f647fa33d65e22d1863c27d345be
Closes-Bug: #1660214

nadeemsyed/swift,smerritt/swift,psachin/swift,swiftstack/swift,clayg/swift,openstack/swift,notmyname/swift,matthewoliver/swift,notmyname/swift,openstack/swift,openstack/swift,nadeemsyed/swift,tipabu/swift,swiftstack/swift,clayg/swift,tipabu/swift,psachin/swift,nadeemsyed/swift,matthewoliver/swift,swiftstack/swift,openstack/swift,tipabu/swift,psachin/swift,redbo/swift,smerritt/swift,nadeemsyed/swift,clayg/swift,smerritt/swift,psachin/swift,clayg/swift,smerritt/swift,notmyname/swift,notmyname/swift,tipabu/swift,matthewoliver/swift,redbo/swift,matthewoliver/swift