Description of problem:

When listing the UserDefinedNetwork via the UI (or CLI), the MTU is not reported.

This makes the user flow cumbersome, since they won't know which MTU they're using unless they log into the VM, and actually check what's there.

Version-Release number of selected component (if applicable):

4.18.0-rc4

How reproducible:

Always

Steps to Reproduce:

1. Provision a primary UDN (namespace scoped)

2. Read the created UDN data.

Actual results: 

The MTU of the network is not available to the user.

Expected results:

The MTU of the network should be available in the UDN contents.

Additional info:

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Affected Platforms:

All