Remove all uses of private in include_role

This option was never supported by ansible and will never be developed.
This change removes the option which will eventually lead to failures in
future versions of ansible.

Change-Id: I8dad86a57d211cf6c17e540991504c9eb7fb34fe
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

playbooks/common-tasks/rsyslog-client.yml

@@ -16,7 +16,6 @@
 - name: Run the rsyslog client role
   include_role:
     name: rsyslog_client
-    private: true
   when:
     - rsyslog_client_enabled | bool
   tags:

playbooks/healthcheck-infrastructure.yml

@@ -184,7 +184,6 @@
     - name: Generate venv for rabbitmq testing
       include_role:
         name: "python_venv_build"
-        private: yes
       vars:
         venv_install_destination_path: "{{ venv_path }}"
         venv_pip_packages:

playbooks/utility-install.yml

@@ -107,7 +107,6 @@
         - name: Install the python venv
           include_role:
             name: "python_venv_build"
-            private: yes
           vars:
             venv_install_destination_path: "{{ utility_venv_bin | dirname }}"
             venv_pip_install_args: >-