Fix the ceilometerlient log curl request incorrectly

Have installed ceilometer on Ubuntu 12.04 (LTS) and added the keystone endpoint
with the url (publicurl,internalurl and
adminurl)like:http://192.168.83.7:8777/refer to the "OpenStack
Installation Guide for Ubuntu 12.04 (LTS)". When using  "ceilometer
--debug meter-list",the ceilometerclient log
request url with a double slash after 8777.

Change-Id: I467704b1fe1d38fe0f0e928bd6f6efe3d8925845
Closes-bug: #1262498