Knob to disable dual-primary for MLAG in L3LS

[onurgashi]

Issue Type

• Template enhancement
• Role enhancement
• Documentatin enhancement (avd.sh)

Is your feature request related to a problem? Please describe.

In some cases there are no management links and we should consider this scenario when forming MLAG and rely on the port-channel instead.

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mlag configuration
   domain-id DC1_POD2_LEAF1
   local-interface Vlan4094
   peer-address 10.254.252.1
  ---   peer-address heartbeat 192.169.0.13 vrf MGMT
   peer-link Port-Channel1
  --- dual-primary detection delay 5 action errdisable all-interfaces

We would need to create a knob so it allows us to enable/disable dual-primary over management.

mlag: dual-primary: < true (default) | false >

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[ksator]

@onurgashi @titom73 I am adding a var dual_primary_detection (default is true) to l3leaf/defaults and l3leaf/node_groups/group and l2leaf/defaults and l2leaf/node_groups/group. already done for l3leaf
This var will be consumed by l3ls role to generate structured conf that will be consumed by cli_config_gen role.
No need to set this var at fabric level as we can set it at l3leaf/defaults and l2leaf/defaults ?

[onurgashi]

Exactly, so we can specify this globally, and also per device if we want to make changes.

[ksator]

done. will add molecule tests and will update doc later on. meanwhile I am submitting a draft PR so this can be reviewed