Feat(eos_designs): Add support for multiple descriptions for l3_interfaces

[gmuloc]

Change Summary

Add the ability to have a list of descriptions for l3_interfaces

Related Issue(s)

Fixes #2236

Component(s) name

arista.avd.eos_designs

Proposed changes

Documentation

The code checks for the presence of descriptions and make sure the length of the list is as long as the list of interfaces. If so each interface is assigned the description at the same index in the descriptions table.
descriptions takes precedence over the existing description

-        # This will create IP routed interface inside VRF. Length of interfaces, nodes and ip_addresses must match.
+        # This will create IP routed interface inside VRF. Length of interfaces, nodes and ip_addresses and descriptions (if used) must match.
         l3_interfaces:
           - interfaces: [ <interface_name1>, <interface_name2>, <interface_name3> ]
             ip_addresses: [ <IPv4_address/Mask>, <IPv4_address/Mask>, <IPv4_address/Mask> ]
             nodes: [ < node_1 >, < node_2 >, < node_1 > ]
             description: < description >
+            # `descriptions` has precedence over `description`
+            descriptions: [ <description1>, <description2>, description3> ]
             enabled: < true | false >
             mtu: < mtu >
             # EOS CLI rendered directly on the Ethernet interface in the final EOS configuration

How to test

molecule in eos_designs_unit_test

Checklist

User Checklist

• N/A

Repository Checklist

• My code has been rebased from devel before I start
• I have read the CONTRIBUTING document.
• My change requires a change to the documentation and documentation have been updated accordingly.
• I have updated molecule CI testing accordingly. (check the box if not applicable)

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[github-actions]

Conflicts have been resolved. A maintainer will review the pull request shortly.

[emilarista]

LGTM!

[carlbuchmann]

LGTM!