--os-insecure is not correctly passed to Keystoneclient because it
expects a bool type but we assgin a string value to the insecure
parameter, this patch fixes it by using oslo.utils.strutils.bool_from_string.
--os-insecure is ignored by Ceilometerclient.v2.client because it
expects parameter verify rather than insecure, this patch fixes it
by converting insecure to verify if that field is not set.
Change-Id: I545de167cdf8cfec6b5c67984b74327fb76c513a
Closes-Bug: #1394449