Cleaning jenkins/jobs/projects.yaml and others for keystoneclient

As per https://review.openstack.org/#/c/306587/1, we are removing keystone client completely and will be using openstack client instead of keystone client.
Same is specified in http://lists.openstack.org/pipermail/openstack-operators/2015-November/009019.html

So, we should clean keystone related files for project listenings.
For ex,

1. jenkins/jobs/projects.yaml contains:

- project:
    name: python-keystoneclient
    tarball-site: tarballs.openstack.org
    doc-publisher-site: docs.openstack.org

    jobs:
      - python-jobs
      - openstack-publish-jobs
      - pypi-jobs
      - translation-jobs
      - openstack-releasenotes-jobs
      - 'lib-forward-testing-{name}'
      - '{pipeline}-keystoneclient-dsvm-functional{job-suffix}':
          pipeline: gate
          node: ubuntu-trusty
          job-suffix: ''

2. gerrit/projects.yaml

 - project: openstack/python-keystoneclient
  description: OpenStack Identity (Keystone) Client
  options:
    - translate
- project: openstack/python-keystoneclient-kerberos
  description: Kerberos authentication plugins for OpenStack clients.
  acl-config: /home/gerrit2/acls/openstack/python-keystoneclient.config

3. gerritbot/channels.yaml

  projects:

    - openstack/python-keystoneclient

openstack-merges:
  events:
    - change-merged
  branches:
    - master
  projects:
- openstack/python-keystoneclient

4. jenkins/jobs/projects.yaml

- project:
    name: python-keystoneclient
    tarball-site: tarballs.openstack.org
    doc-publisher-site: docs.openstack.org

    jobs:
      - python-jobs
      - openstack-publish-jobs
      - pypi-jobs
      - translation-jobs
      - openstack-releasenotes-jobs
      - 'lib-forward-testing-{name}'
      - '{pipeline}-keystoneclient-dsvm-functional{job-suffix}':
          pipeline: gate
          node: ubuntu-trusty
          job-suffix: ''
          branch-override: default
      - 'gate-{name}-tox-{envlist}':
          envlist: bandit

5. zuul/layout.yaml

  - name: openstack/python-keystoneclient
    template:
      - name: merge-check
      - name: python-jobs
      - name: python3-jobs
      - name: openstack-client-publish-jobs
      - name: check-requirements
      - name: publish-to-pypi
      - name: lib-forward-testing
      - name: translation-jobs
      - name: release-notes-jobs
    check:
      - gate-keystoneclient-dsvm-functional
      - gate-python-keystoneclient-tox-bandit
    gate:
      - gate-keystoneclient-dsvm-functional
      - gate-python-keystoneclient-tox-bandit
    post:
      - python-keystoneclient-coverage
    experimental:
      - gate-grenade-dsvm-forward