Update EVPN EVI Detail Parser schema to make peer route keys optional

[sainc-g]

Updated the schema for ShowL2vpnEvpnEviDetail parser to make peer route keys optional under the bridge_domain -> peer hierarchy.

Description

In certain EVPN EVI detail outputs, peer entries are present without route counters (MAC, MAC/IP, IMET, EAD).
Example CLI:
Peers:
172.16.254.7

Parser was failing with:
SchemaMissingKeyError:
Missing keys:

• mac_routes
• mac_ip_routes
• imet_routes
• ead_routes

Schema defined these keys as mandatory:

'mac_routes': int,
'mac_ip_routes': int,
'imet_routes': int,
'ead_routes': int,

However, device output does not always populate route counters for peers.

Motivation and Context

Converted mandatory peer route keys to optional:

Optional('mac_routes'): int,
Optional('mac_ip_routes'): int,
Optional('imet_routes'): int,
Optional('ead_routes'): int,

Impact

• Prevents parser failures when peers exist without route data
• Supports both scenarios:
  • Peer with route counters
  • Peer without route counters

Screenshots:

Tested with:

1. EVPN EVI output containing peers with routes → Parsed successfully
2. EVPN EVI output containing peers without routes → Parsed successfully
3. No impact observed on existing passing parsers/scripts

Passed Log after parser change - https://earms-trade.cisco.com/tradeui/logs/logfile?logfile=TaskLog.Task-1&begin=10565910&size=45976&archive=%2Fnobackup%2Fsainc%2Fpolaris-dev%2Fpolaris%2Fbinos%2Flinkfarm%2Fsdks-host%2Fiosxe-pyats%2Fnativesdk%2Fsdk%2Fsysroots%2Fx86_64-xesdk-linux%2Fusr%2Fusers%2Fsainc%2Farchive%2F26-02%2Foc_oper_job_2026Feb05_12_40_43_141453.zip&ats=%2Fnobackup%2Fsainc%2Fpolaris-dev%2Fpolaris%2Fbinos%2Flinkfarm%2Fsdks-host%2Fiosxe-pyats%2Fnativesdk%2Fsdk%2Fsysroots%2Fx86_64-xesdk-linux%2Fusr&submitter=sainc&from=trade&view=all&atstype=pyATS

Failed Log before parser changes - https://earms-trade.cisco.com/tradeui/logs/logfile?logfile=TaskLog.Task-1&begin=8470177&size=47839&archive=%2Fnobackup%2Fsainc%2Fpolaris-dev%2Fpolaris%2Fbinos%2Flinkfarm%2Fsdks-host%2Fiosxe-pyats%2Fnativesdk%2Fsdk%2Fsysroots%2Fx86_64-xesdk-linux%2Fusr%2Fusers%2Fsainc%2Farchive%2F26-01%2Foc_oper_job_2026Jan30_08_35_27_280523.zip&ats=%2Fnobackup%2Fsainc%2Fpolaris-dev%2Fpolaris%2Fbinos%2Flinkfarm%2Fsdks-host%2Fiosxe-pyats%2Fnativesdk%2Fsdk%2Fsysroots%2Fx86_64-xesdk-linux%2Fusr&submitter=sainc&from=trade&view=all&atstype=pyATS

Checklist:

• I have updated the changelog.
• I have updated the documentation (If applicable).
• I have added tests to cover my changes (If applicable).
• All new and existing tests passed.
• All new code passed compilation.