EventGrid management APIs: Swagger for new Preview API version

[kalyanaj]

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.

PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• Except for special cases involving multiple contributors, the PR is started from a fork of the main repository, not a branch.
• If applicable, the PR references the bug/issue that it fixes.
• Swagger files are correctly named (e.g. the api-version in the path should match the api-version in the spec).

Quality of Swagger

• I have read the contribution guidelines.
• My spec meets the review criteria:
  • The spec conforms to the Swagger 2.0 specification.
  • The spec follows the guidelines described in the Swagger checklist document.
  • Validation tools were run on swagger spec(s) and have all been fixed in this PR.

[AutorestCI]

Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#2902

[azuresdkci]

Can one of the admins verify this patch?

[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#3522

[AutorestCI]

Automation for azure-sdk-for-java

Nothing to generate for azure-sdk-for-java

[AutorestCI]

Automation for azure-sdk-for-ruby

Nothing to generate for azure-sdk-for-ruby

[AutorestCI]

Automation for azure-sdk-for-go

Encountered a Subprocess error: (azure-sdk-for-go)

Command: dep ensure
Finished with return code 1
and output:

grouped write of manifest, lock and vendor: error while writing out vendor tree: failed to write dep tree: failed to export golang.org/x/crypto:
	(1) failed to list versions for https://go.googlesource.com/crypto: fatal: unable to access 'https://go.googlesource.com/crypto/': The requested URL returned error: 502
: exit status 128

[kalyanaj]

To make it easier to review, the first three commits are just setting up the baseline (exact copy of the swagger + examples from the already shipped 2018-05-01-preview API version), commit 4 done today shows the diff for what's different between that API version and the new API version, and the new example files.

[kalyanaj]

@sarangan12 , can you please help take a look at this PR? This will enable us to move to the next steps of SDK generation/CLI etc.

Thanks!

Kalyan