Use openstack_venv_python_executable

Make masakari respect set openstack_venv_python_executable
This also will create py3 venvs by default

Change-Id: I9d7abbeff0f68cad3b646cde270437c88554080c

defaults/main.yml

@@ -21,6 +21,7 @@ debug: False
 # clouds.yaml properly configured.
 masakari_service_setup_host: "{{ openstack_service_setup_host | default('localhost') }}"
 masakari_service_setup_host_python_interpreter: "{{ openstack_service_setup_host_python_interpreter | default((masakari_service_setup_host == 'localhost') | ternary(ansible_playbook_python, ansible_python['executable'])) }}"
+masakari_venv_python_executable: "{{ openstack_venv_python_executable | default('python2') }}"
 
 # Set the package install state for distribution and pip packages
 # Options are 'present' and 'latest'

tasks/main.yml

@@ -67,6 +67,7 @@
   import_role:
     name: "python_venv_build"
   vars:
+    venv_python_executable: "{{ masakari_venv_python_executable }}"
     venv_build_constraints: "{{ masakari_git_constraints }}"
     venv_build_distro_package_list: "{{ masakari_devel_distro_packages }}"
     venv_install_destination_path: "{{ masakari_bin | dirname }}"

vars/debian.yml

@@ -26,7 +26,7 @@ masakari_devel_distro_packages:
 
 masakari_monitor_distro_packages:
   - libsystemd-dev
-  - python-libvirt
+  - python3-libvirt
 
 masakari_monitor_packages_to_symlink:
-  - python-libvirt
+  - python3-libvirt