Rename MPI to CustomMPI to match Batch AI service

[llidev]

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• 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).

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This PR aims to fix a typo on Batch AI service swagger

[AutorestCI]

Automation for azure-sdk-for-ruby

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

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/github_tools.py", line 32, in exception_to_github
    yield context
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/restapi/github.py", line 167, 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 182, 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 245, in generate_sdk_from_git_object
    with manage_git_folder(gh_token, Path(temp_dir) / Path("rest"), branched_rest_api_id, pr_number=pr_number) as restapi_git_folder, \
  File "/usr/lib/python3.6/contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/github_tools.py", line 266, in manage_git_folder
    clone_to_path(gh_token, temp_dir, split_git_id[0], branch_or_commit=branch, pr_number=pr_number)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/github_tools.py", line 199, in clone_to_path
    _git_clone_to_path(https_authenticated_url, folder)
  File "/usr/local/lib/python3.6/dist-packages/swaggertosdk/git_tools.py", line 76, in clone_to_path
    repo = Repo.clone_from(https_authenticated_url, str(folder))
  File "/usr/local/lib/python3.6/dist-packages/git/repo/base.py", line 982, in clone_from
    return cls._clone(git, url, to_path, GitCmdObjectDB, progress, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/git/repo/base.py", line 933, in _clone
    finalize_process(proc, stderr=stderr)
  File "/usr/local/lib/python3.6/dist-packages/git/util.py", line 333, in finalize_process
    proc.wait(**kwargs)
  File "/usr/local/lib/python3.6/dist-packages/git/cmd.py", line 415, in wait
    raise GitCommandError(self.args, status, errstr)
git.exc.GitCommandError: Cmd('git') failed due to: exit code(128)
  cmdline: git clone -v https://AutorestCI:58ab395c311d1bd75b3e1db1cc8adaf9acc42afe@github.com/Azure/azure-rest-api-specs.git /tmp/tmp_5zj9vh0/rest
  stderr: 'Cloning into '/tmp/tmp_5zj9vh0/rest'...
fatal: unable to access 'https://AutorestCI:58ab395c311d1bd75b3e1db1cc8adaf9acc42afe@github.com/Azure/azure-rest-api-specs.git/': SSL connection timeout
'

[AutorestCI]

Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#2773

[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#2809

[AutorestCI]

Automation for azure-sdk-for-java

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-java#2162

[AutorestCI]

Automation for azure-sdk-for-go

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-go#2160

[dsgouda]

@sarangan12 This causes a breaking change in the C# SDKs generated, did you confirm the same.