Remove lib-forward-testing from Designate Client

Designate Client is not installed as part of stock
devstack, so this job hasn't been testing anything.

In addition, a recent DevStack addition to valdidate
all libs-from-git are correctly installed now causes
this job to fail every time.

Change-Id: I5d22fe0e209265475c24e4c620e2fa2a4bcfd4ec

jenkins/jobs/projects.yaml

@@ -1502,7 +1502,6 @@
       - python-jobs
       - openstack-publish-jobs
       - pypi-jobs
-      - 'lib-forward-testing-{name}'
 
 
 - project:

zuul/layout.yaml

@@ -3283,7 +3283,6 @@ projects:
       - name: openstack-client-publish-jobs
       - name: check-requirements
       - name: publish-to-pypi
-      - name: lib-forward-testing
     check:
       - gate-designate-dsvm-powerdns
       - gate-python-designateclient-python34