fix(anta.tests): Add support for more options in VerifyL3MTU

[titom73]

Add support for more options in anta.tests.interfaces.VerifyL3MTU

• Generic MTU expected on all interfaces
• A list of specific MTU per interface
• A list of interfaces to ignore (added to built-in excluded interfaces)

List of excluded interfaces: ["Management", "Loopback", "Vxlan", "Tunnel"]

Input example:

anta.tests.interfaces:
  VerifyL3MTU:
    mtu: 1500
    ignored_interfaces:
      - Management1
      - Vxlan1
    specific_mtu:
      - Ethernet1/1: 1500

Example output:

┏━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Device IP ┃ Test Name                ┃ Test Status ┃ Message(s)                                          ┃ Test description                                                                    ┃ Test category ┃
┡━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ spine01   │ VerifyZeroTouch          │ success     │                                                     │ Verifies ZeroTouch is disabled.                                                     │ configuration │
│ spine01   │ VerifyRunningConfigDiffs │ success     │                                                     │                                                                                     │ configuration │
│ spine01   │ VerifyL3MTU              │ failure     │ Some interfaces do not have correct MTU configured: │ Verifies the global layer 3 Maximum Transfer Unit (MTU) for all layer 3 interfaces. │ interfaces    │
│           │                          │             │ [{'Ethernet1': 9214}, {'Ethernet6': 9214}]          │                                                                                     │               │
└───────────┴──────────────────────────┴─────────────┴─────────────────────────────────────────────────────┴─────────────────────────────────────────────────────────────────────────────────────┴───────────────┘

[carl-baillargeon]

LGTM

[mtache]

Working with cEOS