vxlan-gpe: agent crashes upon restart due to lisp_add_del_local_eid API call failure

[Onong Tayeng]

When VPP already contains a local eid and ML2 agent is restarted, it crashes:

2020-08-24 08:18:18.309 10081 CRITICAL networking_vpp.agent.server [-] Failed VPP call to lisp_add_del_local_eid(, {'is_add': True, 'eid': {'type': 1, 'address': {'mac': b'\xfa\x16>\xd76\xfe'}}, 'locator_set_name': 'net-vpp-gpe-lset-1', 'vni': 999}): retval is -81

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/747758

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/747758
Committed: https://git.openstack.org/cgit/x/networking-vpp/commit/?id=04e56086ff159a8236a584aa85d8f721f5bbfe31
Submitter: Zuul
Branch: master

commit 04e56086ff159a8236a584aa85d8f721f5bbfe31
Author: Onong Tayeng <email address hidden>
Date: Mon Aug 24 21:10:44 2020 +0530

    vxlan-gpe: fix agent crash due to lisp_add_del_local_eid API call failure

    Before trying to add a new lisp local eid in VPP, ML2 agent
    checks against the in-memory map of local eids. But when the agent
    is restarted, it builds the map of local eids by querying VPP. This
    results in the in-memory map to contain MACAddress object from PAPI
    instead of a string. This causes the check to fail and the attempt
    to create the local eid fails causing the agent to crash.

    Change-Id: Ib342260407100f6aa3e53a531f2130be9d4a9d83
    Closes-Bug: #1892749