Remove zuulv2.5 hacks

Now that zuulv3 is well into development, we can stop installing
things related to zuulv2.5.

Change-Id: Icd630871ad2991cdf884f6569237827100934138
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

tasks/install.yaml

@@ -26,16 +26,3 @@
   when: zuul_install_method == 'git' or zuul_install_method == 'pip'
 
 - include: "install/{{ zuul_install_method }}.yaml"
-
-# TODO(pabelanger): Remove once https://review.openstack.org/#/c/316387/ has
-# been merged.
-- name: Install missing pip dependencies
-  become: yes
-  pip:
-    name: "{{ item.name }}"
-    version: "{{ item.version|default(omit) }}"
-    virtualenv: "{{ zuul_pip_virtualenv|default(omit) }}"
-  with_items:
-    - { name: 'jenkins-job-builder', version: '1.6.1' }
-    - { name: 'pyzmq' }
-  when: zuul_install_method == 'git' or zuul_install_method == 'pip'

templates/etc/zuul/zuul.conf

@@ -23,7 +23,6 @@ pidfile = /var/run/zuul-scheduler/zuul-scheduler.pid
 state_dir = /var/lib/zuul
 
 [executor]
-jenkins_jobs=/var/lib/zuul
 log_config = /etc/zuul/executor-logging.conf
 workspace_root=/var/lib/zuul/workspace