Adding java tag for 2018-04 network

[anuchandy]

This checklist is used to make sure that common issues in a pull request are addressed. This will expedite the process of getting your pull request merged and avoid extra work on your part to fix issues discovered during the review process.

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[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#2610

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Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#2376

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Automation for azure-sdk-for-ruby

Nothing to generate for azure-sdk-for-ruby

[dsgouda]

LGTM

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Automation for azure-sdk-for-java

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-java#2135

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Automation for azure-sdk-for-go

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