[Datafactory] Adding additionProperties to allow serializing/deserializing new properties as JSON extension data

[hvermis]

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[azuresdkciprbot]

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File: specification/datafactory/resource-manager/readme.md
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[azuresdkciprbot]

Hi There,

I am the AutoRest Linter Azure bot. I am here to help. My task is to analyze the situation from the AutoRest linter perspective. Please review the below analysis result:

File: specification/datafactory/resource-manager/readme.md
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[sergey-shandar]

@hvermis please, fix examples according to new changes. See examples validation errors here https://travis-ci.org/Azure/azure-rest-api-specs/jobs/305486006. The PR contains SDK breaking changes.

[hvermis]

Opened an issue to track fixing the examples:
#2038

[AutorestCI]

No modification for AutorestCI/azure-sdk-for-ruby

[AutorestCI]

Azure/azure-sdk-for-python#1640