Use venv_packages_to_symlink to symlink to import libvirt-python

Currently on CentOS7, while deploying nova, it gives libvirt
module import error. By adding venv_packages_to_symlink in
nova_source_install will symlink the packages defined in
nova_compute_kvm_packages_to_symlink and fixes the issue.

It removes nova_compute_kvm_install.yml to use python_venv_build
role.

Change-Id: I20a181c6c4901b3cc846a9f665e5def98aac5059

tasks/drivers/kvm/nova_compute_kvm_install.yml

@@ -54,7 +54,3 @@
     state: link
     owner: "{{ nova_qemu_user }}"
     group: "{{ nova_qemu_group }}"
-
-- name: Install nova kvm packages from PIP
-  include_tasks: nova_compute_kvm_install_source.yml
-  when: nova_install_method == 'source'

tasks/drivers/kvm/nova_compute_kvm_install_source.yml

@@ -1,56 +0,0 @@
----
-# Copyright 2018, SUSE Linux GmbH
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Note (odyssey4me):
-# These python libraries have C bindings which tend to be very
-# particular about the version of their companion packages.
-# To ensure things run smoothly for stable releases, we opt to
-# use the distro packages for these and symlink the appropriate
-# library files and binding into the venv.
-
-- name: Find the venv's python version
-  find:
-    paths: "{{ nova_bin | dirname }}/lib/"
-    patterns: "python*"
-    file_type: directory
-    recurse: no
-  register: python_venv_details
-
-- name: Set python venvs details
-  set_fact:
-    venv_python_version: "{{ (python_venv_details.files[0].path | basename) }}"
-    venv_python_major_version: "{{ (python_venv_details.files[0].path | basename)[:-2] }}"
-    venv_python_lib_folder: "{{ python_venv_details.files[0].path }}"
-
-- name: Search for lib files to link
-  shell: >-
-    {{ (ansible_pkg_mgr == 'apt') | ternary('dpkg -L ' ~ (nova_compute_kvm_packages_to_symlink | join(' ')), 'rpm -ql ' ~ (nova_compute_kvm_packages_to_symlink | join(' ')) ) }}
-    | egrep '^.*{{ venv_python_major_version }}.*/(site|dist)-packages/.*'
-  args:
-    warn: no
-  changed_when: false
-  register: _python_files
-  tags:
-    - nova-pip-packages
-
-- name: Link the python host package files into venv
-  file:
-    src: "{{ item }}"
-    dest: "{{ venv_python_lib_folder }}/site-packages/{{ item | basename }}"
-    state: link
-    force: yes
-  with_items: "{{ _python_files.stdout_lines }}"
-  tags:
-    - nova-pip-packages

tasks/nova_install_source.yml

@@ -43,6 +43,7 @@
     venv_build_distro_package_list: "{{ nova_devel_distro_packages }}"
     venv_install_destination_path: "{{ nova_bin | dirname }}"
     venv_pip_install_args: "{{ nova_pip_install_args }}"
+    venv_packages_to_symlink: "{{ (nova_services['nova-compute']['group'] in group_names) | ternary(nova_compute_kvm_packages_to_symlink, []) }}"
     venv_pip_packages: >-
       {{ nova_pip_packages +
          ((nova_services['nova-novncproxy']['group'] in group_names) and (nova_console_type == 'novnc')) | ternary(nova_novnc_pip_packages, []) +