Fix incorrect specs in Network

[anton-evseev]

• Fix error in Application Gateway specs caused by merge
• Copy changes from Fixing example for virtual wan supported security provider api. #5194 into API version 2018-12-01
• Cherry pick typo: network/resource-manager/Microsoft.Network/stable/2018-12-01 #5199

Contribution checklist:

• I have reviewed the documentation for the workflow.
• Validation tools were run on swagger spec(s) and have all been fixed in this PR.
• The OpenAPI Hub was used for checking validation status and next steps.

ARM API Review Checklist

• Service team MUST add the "WaitForARMFeedback" label if the management plane API changes fall into one of the below categories.
• adding/removing APIs.
• adding/removing properties.
• adding/removing API-version.
• adding a new service in Azure.

Failure to comply may result in delays for manifest application. Note this does not apply to data plane APIs.

• If you are blocked on ARM review and want to get the PR merged urgently, please get the ARM oncall for reviews (RP Manifest Approvers team under Azure Resource Manager service) from IcM and reach out to them.
  Please follow the link to find more details on API review process.

[azuresdkci]

Can one of the admins verify this patch?

[AutorestCI]

Automation for azure-sdk-for-js

A PR has been created for you based on this PR content.

Once this PR will be merged, content will be added to your service PR:
Azure/azure-sdk-for-js#1221

[AutorestCI]

Automation for azure-sdk-for-ruby

A PR has been created for you based on this PR content.

Once this PR will be merged, content will be added to your service PR:
Azure/azure-sdk-for-ruby#2125

[AutorestCI]

Automation for azure-sdk-for-python

A PR has been created for you based on this PR content.

Once this PR will be merged, content will be added to your service PR:
Azure/azure-sdk-for-python#4193

[AutorestCI]

Automation for azure-sdk-for-go

A PR has been created for you based on this PR content.

Once this PR will be merged, content will be added to your service PR:
Azure/azure-sdk-for-go#4088

[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#4555

[AutorestCI]

Automation for azure-sdk-for-java

Encountered an unknown error: (azure-sdk-for-java)

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/azure_devtools/ci_tools/github_tools.py", line 33, in exception_to_github
    yield context
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github.py", line 170, in rest_handle_action
    return rest_pull_close(body, restapi_repo, sdk_pr_target_repo, sdkbase, sdk_tag)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github.py", line 185, in rest_pull_close
    rest_pr_management(rest_pr, sdk_pr_target_repo, sdk_tag, sdk_default_base)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github_handler.py", line 151, in rest_pr_management
    sdk_tag=sdk_tag
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/SwaggerToSdkNewCLI.py", line 309, in generate_sdk_from_git_object
    sdk_repo.git.push('origin', base_branch, set_upstream=True)
  File "/usr/local/lib/python3.6/dist-packages/git/cmd.py", line 548, in <lambda>
    return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/git/cmd.py", line 1014, in _call_process
    return self.execute(call, **exec_kwargs)
  File "/usr/local/lib/python3.6/dist-packages/git/cmd.py", line 825, in execute
    raise GitCommandError(command, status, stderr_value, stdout_value)
git.exc.GitCommandError: Cmd('git') failed due to: exit code(128)
  cmdline: git push --set-upstream origin restapi_auto_network/resource-manager
  stderr: 'remote: Permission to Azure/azure-sdk-for-java.git denied to AutorestCI.
fatal: unable to access 'https://AutorestCI:58ab395c311d1bd75b3e1db1cc8adaf9acc42afe@github.com/Azure/azure-sdk-for-java.git/': The requested URL returned error: 403'

[anton-evseev]

@dsgouda please take a look, Travis job has passed

[dsgouda]

LGTM