[CI] Drop Python 3.7 job. Fix ansible-lint errors.

Two changes to fix CI:
- Drop Python 3.7 job as Victoria is in extended maintenance now [1][2]
- Name tasks to fix 'unnamed-task' ansible-lint errors

[1]: https://review.opendev.org/c/openstack/governance/+/693743
[2]: https://review.opendev.org/c/openstack/governance/+/743847

Change-Id: I7324467e54deda1a05063cfa1b52a276f7622442

ansible/host_setup.yml

@@ -21,7 +21,8 @@
   tags:
     - host-setup
   tasks:
-    - block:
+    - name: Set up host
+      block:
         - name: Configure host for Libvirt
           include_role:
             name: stackhpc.libvirt-host

ansible/hypervisor_setup.yml

@@ -29,7 +29,8 @@
   # Don't remove log directory during teardown to preserve historical logs.
   when: cmd != 'teardown'
 
-- block:
+- name: Check if OVS is installed
+  block:
     - name: Check if ovs-vsctl command is present
       command: ovs-vsctl --version
       register: ovs_vsctl_check

ansible/physical_network.yml

@@ -35,7 +35,8 @@
     source_type: linuxbridge
   when: if_details.stdout_lines[-1].split()[0] == 'bridge'
 
-- block:
+- name: Register source interface as an Open vSwitch bridge
+  block:
     - name: Get list of OVS bridges
       command: ovs-vsctl list-br
       register: ovs_bridges
@@ -58,7 +59,8 @@
   become: true
   when: bridge_type == "openvswitch"
 
-- block:
+- name: Create Tenks bridge
+  block:
     - name: Check if Tenks bridge exists
       stat:
         path: /sys/class/net/{{ tenks_bridge }}
@@ -131,7 +133,7 @@
         state: "{{ state }}"
       become: true
 
-- name: Plug source interface into Tenks bridge
+- name: Plug source interface into Tenks OVS bridge
   openvswitch_port:
     bridge: "{{ tenks_bridge }}"
     port: "{{ source_interface }}"
@@ -144,7 +146,8 @@
     - state != 'absent'
   become: true
 
-- block:
+- name: Plug source interface into Tenks Linux bridge
+  block:
     - name: Speculatively check interface's master
       command: >-
         realpath /sys/class/net/{{ source_interface }}/master
@@ -152,7 +155,7 @@
       failed_when: false
       changed_when: false
 
-    - name: Plug source interface into Tenks bridge
+    - name: Plug source interface into Tenks Linux bridge
       command: >-
         {{ tenks_ip_path }} link set dev {{ source_interface }} master {{ tenks_bridge }}
       changed_when: true

ansible/resource_wait.yml

@@ -22,7 +22,8 @@
       loop_control:
         loop_var: spec
 
-    - block:
+    - name: Include the wait-for-resources role
+      block:
         - name: Check that OpenStack credentials exist in the environment
           fail:
             msg: >

ansible/roles/ironic-enrolment/tasks/main.yml

@@ -44,7 +44,8 @@
 # If using clouds.yaml for authentication we need to pass in the ironic_url
 # argument to the os_ironic module, due to a quirk in its implementation.
 # Grab the endpoint from the file.
-- block:
+- name: Set ironic_url for os_ironic module
+  block:
     - name: Query clouds.yaml
       os_client_config:
         clouds: "{{ lookup('env', 'OS_CLOUD') }}"

ansible/roles/veth-pair/tasks/absent.yml

@@ -1,5 +1,6 @@
 ---
-- block:
+- name: Unplug veth from source bridge
+  block:
     - include_tasks: is-attached.yml
       vars:
         bridge: "{{ veth_pair_source_bridge }}"

ansible/roles/veth-pair/tasks/present.yml

@@ -27,7 +27,8 @@
   when: veth_pair_peer_bridge_type == "openvswitch"
   become: true
 
-- block:
+- name: Plug veth into source bridge
+  block:
     - include_tasks: is-attached.yml
       vars:
         bridge: "{{ veth_pair_peer_bridge }}"
@@ -42,7 +43,8 @@
       become: true
   when: veth_pair_peer_bridge_type == "linuxbridge"
 
-- block:
+- name: Plug veth into source bridge
+  block:
     - include_tasks: is-attached.yml
       vars:
         bridge: "{{ veth_pair_source_bridge }}"

zuul.d/project.yaml

@@ -9,7 +9,6 @@
       jobs:
         - openstack-tox-pep8
         - openstack-tox-py36
-        - openstack-tox-py37
         - openstack-tox-py38
         - openstack-tox-py39
         - tenks-tox-ansible-lint
@@ -26,7 +25,6 @@
       jobs:
         - openstack-tox-pep8
         - openstack-tox-py36
-        - openstack-tox-py37
         - openstack-tox-py38
         - openstack-tox-py39
         - tenks-tox-ansible-lint