Access interface parameters

[mkilar123]

This PR fixes:
Fixes #430

This PR is to add parameters allowing the control on enabling three features:

• CDP
• PFD
• Switchport monitor modes

The controls are made available for following interface types:

• physical ethernet configured as access port,
• physical ethernet configured as trunk port,
• non-vpc port-channel configured as access port,
• non-vpc port-channel configured as trunk port,

The controls are implemented as a simple bolean values.
For the keys used in the module i tried to be consistend with what's currently used:
"ENABLE_PFC": "enable_pfc",
"ENABLE_MONITOR": "enable_monitor",
"CDP_ENABLE": "enable_cdp",

Tested each interface type in the lab specifying the following set of attributes:

• none of the three controls are defined,
• all three controls are defined and match the defaults,
• all three controls are defined and set to values opposite to defaults,
• only one or two controls are defined.

[mikewiebe]

@mkilar123 you can run the ansible-sanity tests in your local workspace using the following command instead of making changes to the PR and waiting for me to approve the run

https://github.com/CiscoDevNet/ansible-dcnm/blob/develop/.github/workflows/main.yml#L85

That way you can get the tests passing locally before pushing the changes

[mkilar123]

corrected the documentation typos that made the tests fail