[Network] Protocol not support UDP anymore

**Query/Question**
In class com.microsoft.azure.management.network.Protocol, it only supports Tcp, Http, Https and Icmp. Why Udp has been removed in new version?

***Why is this not a Bug or a feature Request?***

Questions about api change.

**Setup (please complete the following information if applicable):**

- Version of the Library used : 1.13.0

**Information Checklist**
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