Change location for MTU knob so SVI 4093 uses it

[onurgashi]

Change Summary

The MTU knob was under OSPF only, and didn't cover IS-IS and BGP scenarios for L3LS.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Documentation content changes
• Other (please describe):

Related Issue(s)

Fixes #523

Component(s) name

eos_l3ls_evpn

Proposed changes

How to test

venv

!
interface Vlan4093
   description MLAG_PEER_L3_PEERING
   mtu 9214
   ip address 10.255.254.0/31
!
interface Vlan4094
   description MLAG_PEER
   mtu 9214
   no autostate
   ip address 10.255.252.0/31

Checklist:

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed (pre-commit, make linting and make sanity-lint).
• I have updated molecule CI testing accordingly

[titom73]

LGTM!

[ClausHolbechArista]

LGTM

[titom73]

cherry-picked to pre-release branch: https://github.com/titom73/ansible-avd/tree/release-v1.1.3-preparation