Remove join filter from pip module tasks

Ansible 2.2 now treats the 'name' argument for the pip module
as a list, removing the need for us to implement the join
filter to optimise the install execution.

Change-Id: Ifbeae6a808f6c8be34cd7bb4d3a8d8e7ba1e5c9d

tasks/zaqar_install.yml

@@ -35,7 +35,7 @@
 
 - name: Install requires pip packages
   pip:
-    name: "{{ zaqar_requires_pip_packages | join(' ') }}"
+    name: "{{ zaqar_requires_pip_packages }}"
     state: "{{ zaqar_pip_package_state }}"
     extra_args: >-
       {{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''),'') }}
@@ -105,7 +105,7 @@
 
 - name: Install pip packages (venv)
   pip:
-    name: "{{ zaqar_pip_packages | join(' ') }}"
+    name: "{{ zaqar_pip_packages }}"
     state: "{{ zaqar_pip_package_state }}"
     virtualenv: "{{ zaqar_bin | dirname }}"
     virtualenv_site_packages: "no"