Workaround for ansible 2.13.13 customized module ImportError (sonic-net#11804)

What is the motivation for this PR?
After upgraded ansible version to core 2.13.13 in sonic-mgmt docker, customized ansible modules can no longer import modules from the ansible package. They can only import modules under ansible.module_utils.

For example, the vmhost_server_info module has below imports:

from ansible.parsing.dataloader import DataLoader
from ansible.inventory.manager import InventoryManager
Run this module using ansible 2.13.13 will raise ImportError "ansible.module_utils.common.yaml not found.".

How did you do it?
This workaround is to convert the vmhost_server_info module to an ordinary script and use ansible script module to directly run it.

This change also fixed a bug of building vlan_intfs list. This bug is only triggered in new ansible version.

How did you verify/test it?
Tested deploy-mg on VS setup.

Signed-off-by: Xin Wang <xiwang5@microsoft.com>

Author: wangxin

ansible/config_sonic_basedon_testbed.yml

@@ -161,7 +161,7 @@
 
   - name: find all vlan interface names for T0 topology
     set_fact:
-      vlan_intfs: "{{ vlan_intfs|default([])}} + ['{{ port_alias[item] }}' ]"
+      vlan_intfs: "{{ vlan_intfs|default([]) + [port_alias[item]] }}"
     with_items: "{{ host_if_indexes }}"
     when: "('host_interfaces_by_dut' in vm_topo_config) and ('tor' in vm_topo_config['dut_type'] | lower)"
 

ansible/dualtor/config_simulated_y_cable.yml

@@ -14,12 +14,15 @@
   when: restart_pmon is not defined and restart_pmon|bool == true
 
 - name: Get host server address
-  vmhost_server_info: vmhost_server_name={{ testbed_facts['server'] }} vm_file={{ vm_file }}
+  script: scripts/vmhost_server_address.py --inv-file veos_vtb --server-name server_1
+  args:
+    executable: python
   delegate_to: localhost
+  register: vmhost_server_address
 
 - name: Set y cable simulator server address
   set_fact:
-    mux_simulator_server: "{{ vmhost_server_address }}"
+    mux_simulator_server: "{{ vmhost_server_address.stdout }}"
 
 - name: Set default y cable simulator server port
   set_fact:

ansible/library/vmhost_server_info.py

@@ -0,0 +1,58 @@
+"""This script is to parse ansible inventory file and return the mgmt IP for given host server.
+"""
+
+import argparse
+import sys
+
+from ansible.parsing.dataloader import DataLoader
+from ansible.inventory.manager import InventoryManager
+
+
+def main(args):
+    server_name = args.server_name
+    inv_file = args.inv_file
+    ip_ver = args.ip_ver
+
+    inv_mgr = InventoryManager(loader=DataLoader(), sources=inv_file)
+    all_hosts = inv_mgr.get_hosts(pattern=server_name)
+
+    if len(all_hosts) == 0:
+        sys.stderr.write("No host matches {} in inventory file {}".format(server_name, inv_file))
+        sys.exit(1)
+    else:
+        for host in all_hosts:
+            if host.name.startswith('VM'):
+                continue
+            if ip_ver == 'ipv4':
+                result = host.get_vars().get("ansible_host", "")
+            else:
+                result = host.get_vars().get("ansible_hostv6", "")
+            sys.stdout.write(result)
+            sys.exit(0)
+
+        sys.stderr.write(
+            "Unable to find IP address of host server {} in inventory file {}".format(server_name, inv_file)
+        )
+        sys.exit(2)
+
+
+if __name__ == "__main__":
+
+    parser = argparse.ArgumentParser(description='Gather mgmt IP for given host server (like server_17)')
+    parser.add_argument(
+        '--server-name',
+        help='The name of vm_host server, like server_1'
+    )
+    parser.add_argument(
+        '--inv-file',
+        default='veos',
+        help='The inventory file contains server information. Default is veos.'
+    )
+    parser.add_argument(
+        '--ip-ver',
+        default='ipv4',
+        choices=['ipv4', 'ipv6'],
+        help='The IP version to return. Default is ipv4.'
+    )
+    args = parser.parse_args()
+    main(args)