Drop usage of nova_spice_distro_packages in the role

There was a commit 3 years ago which switched to installing SPICE
from source rather than from packages.  It also included a section
which would 'remove' and 'cleanup' packages for SPICE which was
not removed.

With time, it looks like we've added it to the list of things to
install, only to uninstall it in the next task.  This removes all
of this extra cruft and further removes our dependency on EPEL.

Change-Id: I9bbe109d50040bbc02b194f9486ab581a6cc51a9

tasks/nova_install.yml

@@ -27,22 +27,6 @@
     update_cache: "{{ (ansible_pkg_mgr in ['apt', 'zypper']) | ternary('yes', omit) }}"
     cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
 
-- name: Remove known problem packages for the Spice console
-  package:
-    name: "{{ item }}"
-    state: absent
-  register: remove_packages
-  until: remove_packages|success
-  retries: 5
-  delay: 2
-  with_items: "{{ nova_spice_distro_packages }}"
-  when:
-    - "nova_services['nova-spicehtml5proxy']['group'] in group_names"
-    - nova_console_type == "spice"
-  tags:
-    - nova-apt-packages
-    - nova-spice-apt-packages
-
 - name: Create developer mode constraint file
   copy:
     dest: "/opt/developer-pip-constraints.txt"

vars/main.yml

@@ -26,9 +26,6 @@ nova_package_list: |-
   {%   if nova_console_type == 'novnc' %}
   {%     set _ = packages.extend(nova_novnc_distro_packages) %}
   {%   endif %}
-  {%   if nova_console_type == 'spice' %}
-  {%     set _ = packages.extend(nova_spice_distro_packages) %}
-  {%   endif %}
   {% endif %}
   {% if nova_services['nova-compute']['group'] in group_names %}
   {%   if nova_virt_type in ['kvm', 'qemu'] %}

vars/redhat-7.yml

@@ -27,10 +27,6 @@ nova_distro_packages:
   - which
   - libxml2-devel
 
-# Spice console yum packages
-nova_spice_distro_packages:
-  - spice-html5
-
 nova_novnc_distro_packages:
   - js-jquery
   - js-underscore

vars/suse-42.yml

@@ -28,10 +28,6 @@ nova_distro_packages:
   - which
   - libxml2-devel
 
-# Spice console zypper packages
-nova_spice_distro_packages:
-  - libspice-controller0
-
 nova_novnc_distro_packages:
   - python-websockify
 

vars/ubuntu-16.04.yml

@@ -27,10 +27,6 @@ nova_distro_packages:
   - iptables
   - libxml2-dev
 
-# Spice console apt packages
-nova_spice_distro_packages:
-  - spice-html5
-
 nova_novnc_distro_packages:
   - libjs-jquery
   - libjs-sphinxdoc