move mechutils#ToInterfaceName into sdk or api repo

[pperiyasamy]

The mechutils#ToInterfaceName method is generic and is used to retrieve client or endpoint container interface name from forwarder perspective, if this moved into sdk or api repo, chain elements in other sdk-* can reuse it.
some of the sdk-kernel and sdk-sriov chain elements still uses mechanism.InterfaceName(conn) method to retrieve interface name which is logically incorrect. for example connectioncontextkernel , because of this cmd-forwarder-vpp ci is failing when sdk-vpp adapts to use it.

[denis-tingaikin]

@edwarnicke, @pperiyasamy We'll look at the issue.
We'll have assigned some one from team tomorrow.

[edwarnicke]

Something to keep in mind... the solution should be:

• If the client has not assigned an interface name, assign it using the client's connection id
• If the endpoint has not assigned a name, assign it using the endpoints connection id

I suspect that putting something in api and into the client and server endpoint chains may be the correct way to handle this.

Also, please test solution with cmd-forwarder-vpp

[denis-tingaikin]

@pperiyasamy It looks like all pieces done. Closing this. Be free to reopen if we missed something.