Config failure when non-unique iosxr configuration lines are uploaded.

[vasger1984]

Hi Ansible Team,

we have Cisco IOS XR routers, where we would like to configure multiple policy-maps each containing the relevant configuration under the class class-default section.
Original configuration:

policy-map pol_map_1
  class class-default
    set mpls experimental imposition 5
end-policy-map

policy-map pol_map_2
  class class-default
    set mpls experimental imposition 7
end-policy-map

Unfortunately because the below linked line we are not able to do that as the 2nd, 3rd, ... class class-default lines are removed from the commands list. The IOS XR is not supporting the formal configuration syntax in case of policy-maps.

This is the resulted commands list:

policy-map pol_map_1
  class class-default
    set mpls experimental imposition 5
end-policy-map

policy-map pol_map_2
    set mpls experimental imposition 7
end-policy-map

Due to this the router doesn't accept the configuration, and fails with syntax error at the set mpls experimental imposition 7 line.

https://github.com/ansible-collections/ansible.netcommon/blame/0005f922cc5068e7e4d60099b0cad347f85e1308/plugins/module_utils/network/common/config.py#L405