deprecate "guid" CNI Arg

[adrianchiris]

The process of standardizing infiniband GUID as CNI runtime config parameter has been complete.

• Relevant Specs where updated (CNI, mult-net-spec)
• Support was added in relevant projects

PR Mellanox/ib-kubernetes#70 was the last missing piece.
We should consider deprecating "guid" CNI config so that only infinibandGUID CNI runtime config is used.

Work items:

• Update documentation - mark guid CNI config as deprecated
• Remove related code after <enter X time units here>

Note: multus-cni supports infiniband-guid network-attachment attribute as of V3.6