Remove dash for resource-type in cli
Remove dash for resource-type in cli

For consistent with other openstack cli commands [1], use
`openstack search resource type list` instead of
`openstack search resource-type list`

[1]:
https://github.com/openstack/python-openstackclient/blob/master/setup.cfg

Change-Id: I4f35c0e276101bbdf4f470e082365e8ef25e25bb
Closes-bug: #1536690

openstack/python-searchlightclient,openstack/python-searchlightclient