Use new version of idr.openstack_idr_instance compatible with Ansible 2.10

Also update various references to the minimal Ansible version

Author: sbesson

README.md

@@ -16,7 +16,7 @@ If you are deploying the IDR platform on OpenStack you should have a good workin
 
 All documents assume extensive knowledge of [OMERO](https://www.openmicroscopy.org/site/support/omero5/sysadmins/).
 
-Ansible 2.3 is required.
+Ansible 2.9 is required.
 Some Ansible tasks can take a long time, such as pulling Docker images.
 If you see lost connections you can try setting a keep-alive in your `.ssh/config` file, e.g. `ServerAliveInterval 30`.
 

ansible/requirements.yml

@@ -134,7 +134,7 @@
 # External IDR roles
 
 - name: idr.openstack_idr_instance
-  version: 3.1.2
+  version: 4.0.0
 
 - name: idr.openstack_idr_instance_network
   version: 1.1.2

docs/provisioning.md

@@ -11,7 +11,7 @@ The production (public-facing) IDR (3 servers):
 
 ## Ansible prerequisites
 
-Almost all of the provisioning and deployment in the IDR is done using Ansible 2.1.
+All of the provisioning and deployment in the IDR is done using Ansible 2.10.
 All ansible commands should be run from a shell in the [`ansible`](../ansible) directory.
 
     cd ../ansible