Fix wrong initialization of AuthPlugin for keystone v3

Ceilometerclient doesn't pass domain related arguments to AuthPlugin,
which will cause keystoneclient v3 cannot be used properly.

Change-Id: I2554a36f214c0eae61b7ba6b8580c41b8f8c6370
Closes-Bug: #1391122
Merge "Fix wrong initialization of AuthPlugin for keystone v3"