Configure docker0 bridge address

This was previously conflicting with the InternalApiNetCidr value in
environments/network-environment.yaml.

Change-Id: I3f1cb6f056fb19a1ba93d1076191abe7aca4fa21
Depends-On: Ie803b33c93b931f7fefb87b6833eb22fd59cd92d
Closes-Bug: #1726773

puppet/services/docker.yaml

@@ -46,10 +46,14 @@ outputs:
     value:
       service_name: docker
       config_settings:
-        if:
-        - insecure_registry_is_empty
-        - {}
-        - tripleo::profile::base::docker::insecure_registries: {get_param: DockerInsecureRegistryAddress}
+        map_merge:
+          - tripleo::profile::base::docker::configure_network: true
+            tripleo::profile::base::docker::network_options: "--bip=172.31.0.1/24"
+          -
+            if:
+            - insecure_registry_is_empty
+            - {}
+            - tripleo::profile::base::docker::insecure_registries: {get_param: DockerInsecureRegistryAddress}
       step_config: |
         include ::tripleo::profile::base::docker
       upgrade_tasks:

releasenotes/notes/change_default_docker0_address-6a017b7078825996.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Changed default address of docker0 bridge to be in the last class B private
+    network -- 172.31.0.1/24 -- to stop conflicting with the default network
+    range for InternalApiNetCidr. The docker0 bridge is normally unused in
+    TripleO deployment.