Allow os_neutron to run in check mode

Let role fetch config file/u-c regardless of mode. These are safe
operations to run in check mode and shouldn't affect anything.

Change-Id: I09305017f63993a9bd665f1887b6cc0b6beb6e5b

tasks/main.yml

@@ -96,6 +96,8 @@
     group_names: "{{ group_names }}"
   register: pndata
   when: neutron_provider_networks is not defined
+  check_mode: false
+  changed_when: false
   tags:
     - always
 

tasks/neutron_install.yml

@@ -60,6 +60,7 @@
     url: "{{ neutron_upper_constraints_url }}"
     return_content: yes
   register: _u_c_contents
+  check_mode: false
 
 - name: Install the python venv
   import_role:

tasks/neutron_post_install.yml

@@ -136,6 +136,7 @@
     state: absent
   changed_when: false
   delegate_to: localhost
+  check_mode: false
   with_items: "{{ neutron_core_files }}"
 
 # NOTE(cloudnull): This will ensure strong permissions on all rootwrap files.