Allow to specify eol release for project and fix gates

There's a need to keep building images from eol releases. This commit
introduces ability to specify eol release for project and clone to
{release}-eol instead of stable/{release}

Octavia moved to eol, using ocata-eol instead.

Also fixes gates providing ensure-pip role to executor.

Also pins openSUSE image to 15.1

Change-Id: I041033bb6c9cfe193c4bae9a0b6b4028f4602c5f
Signed-off-by: Andrii Ostapenko <andrii.ostapenko@att.com>

.zuul.d/octavia.yaml

@@ -14,6 +14,8 @@
     parent: loci-base
     vars:
       project: octavia
+      eol:
+        - ocata
     required-projects:
       - openstack/loci
       - openstack/requirements

dockerfiles/leap15/Dockerfile

@@ -1,4 +1,4 @@
-ARG FROM=opensuse/leap:15
+ARG FROM=opensuse/leap:15.1
 FROM ${FROM}
 
 ARG PACKAGE_MIRROR=http://download.opensuse.org/

playbooks/setup-gate.yaml

@@ -1,4 +1,8 @@
 - hosts: all
+  become: yes
+  roles:
+    - ensure-pip
+
   tasks:
     - include_vars: vars.yaml
 
@@ -40,7 +44,6 @@
         - apt:
             name:
               - docker-ce
-              - python-pip
             allow_unauthenticated: True
         - pip:
             name: docker

playbooks/vars.yaml

@@ -74,7 +74,7 @@ distros:
       project:
         PROJECT: "{{ project }}"
         PROJECT_REPO: http://172.17.0.1/git/openstack/{{ project }}
-        PROJECT_REF: "stable/ocata"
+        PROJECT_REF: "{% if eol is defined and 'ocata' in eol %}ocata-eol{% else %}stable/ocata{% endif %}"
         PROJECT_RELEASE: "ocata"
         WHEELS: 172.17.0.1:5000/loci/requirements:ocata-ubuntu_xenial
         FROM: base:ubuntu_xenial