Optimise pip install tasks

Unlike the Ansible apt module, the Ansible pip module does not
recognise a with_items list and process all the items at once.

To optimise the pip install tasks, this patch replaces the use
of with_items with a join filter so that the pip install task
does an install with all the packages in a list, ensuring that
the execution is one action instead of many.

Change-Id: Ib2e9ee2c1f668366905f3c4191bc3a27e84b73ae

tasks/neutron_install.yml

@@ -51,14 +51,13 @@
 
 - name: Install requires pip packages
   pip:
-    name: "{{ item }}"
+    name: "{{ neutron_requires_pip_packages | join(' ') }}"
     state: latest
     extra_args: "{{ pip_install_options_fact }}"
   register: install_packages
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ neutron_requires_pip_packages }}"
 
 - name: Get local venv checksum
   stat:
@@ -124,7 +123,7 @@
 
 - name: Install pip packages
   pip:
-    name: "{{ item }}"
+    name: "{{ neutron_pip_packages | join(' ') }}"
     state: latest
     virtualenv: "{{ neutron_bin | dirname }}"
     virtualenv_site_packages: "no"
@@ -133,7 +132,6 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: "{{ neutron_pip_packages }}"
   when:
     - neutron_get_venv | failed or neutron_developer_mode | bool
   notify: Restart neutron services

tasks/nuage_neutron_config.yml

@@ -14,13 +14,11 @@
 
 - name: Install nuage neutron pip packages
   pip:
-    name: "{{ item }}"
+    name: "{{ neutron_proprietary_nuage_pip_packages | join(' ') }}"
     state: latest
     virtualenv: "{{ neutron_bin | dirname }}"
     virtualenv_site_packages: "no"
   retries: 5
   delay: 2
-  with_items:
-    - "{{ neutron_proprietary_nuage_pip_packages }}"
   when:
     - neutron_services['neutron-server']['group'] in group_names

tasks/plumgrid_config.yml

@@ -30,7 +30,7 @@
 
 - name: Install plumgrid pip packages
   pip:
-    name: "{{ item }}"
+    name: "{{ neutron_optional_plumgrid_pip_packages | join(' ') }}"
     state: latest
     virtualenv: "{{ neutron_bin | dirname }}"
     virtualenv_site_packages: "no"
@@ -40,14 +40,12 @@
   ignore_errors: True
   retries: 5
   delay: 2
-  with_items:
-    - "{{ neutron_optional_plumgrid_pip_packages }}"
   when:
     - neutron_services['neutron-server']['group'] in group_names
 
 - name: Install plumgrid pip packages fall back
   pip:
-    name: "{{ item }}"
+    name: "{{ neutron_optional_plumgrid_pip_packages | join(' ') }}"
     state: latest
     virtualenv: "{{ neutron_bin | dirname }}"
     virtualenv_site_packages: "no"
@@ -56,8 +54,6 @@
   until: install_packages_fall_back|success
   retries: 5
   delay: 2
-  with_items:
-    - "{{ neutron_optional_plumgrid_pip_packages }}"
   when:
     - install_packages | failed
     - neutron_services['neutron-server']['group'] in group_names