WIP: net, localnet, jumbo frame: localnet jumbo no fragmentaion test

[azhivovk]

Short description:

Add new test: Verify tcp connectivity using localnet and jumbo frames
over ovs bridge, without fragmentaion
This test combines the existing localnet and jumbo frame tests

Refactor nncp resource to configure mtu
Refactor fixture and add helper functions

More details:

What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for reviewer:

jira-ticket:

https://issues.redhat.com/browse/CNV-69286

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[azhivovk]

/wip