Don't specify admin_token in paste config

This is not a value that is going to be useful on other systems and
shouldn't be included in the default or test pipelines.

The two similar commits were squashed together here.

(cherry picked from commit ae696056fbac7d74a395710934950e0013cd4d37)
(cherry picked from commit 9db80e79ea3e687000121729648af7e79b7b2d78)

Closes-Bug: #1299332
Change-Id: I714539b7536965fa08a3ddc64493b481df7397e3
Merge "Don't specify admin_token in paste config" into stable/icehouse