[azure_mgmt_*] Prepare to release azure_mgmt_* version 0.12.0

[vishrutshah]

Regarding #958

• Regen all azure_mgmt_* sdks using AzureRest.Ruby version 1.9.3
• Skip generation of azure_mgmt_traffic_manager due to Code changes to remove condition to check for known primary type autorest.ruby#7
• Skip generation of azure_mgmt_web due to [AutoRest.Ruby] Inheritance usage of "Resource" is broken #957
• Update ARM_VERSION file to 0.12.0
• Update swagger_to_sdk config file to version 0.12.0
• Incorporate change [compute] Removing x-ms-azure-resource extension from invalid model ResourceUpdate azure-rest-api-specs#1658 (comment) into azure_mgmt_comput gem
• Update changelog
• Update all azure_mgmt_* sdks' .gemspec file to depend on ms_rest_azure version ~>0.9.0
• Update release process documentation w.r.t AutoRest.Ruby generator

[veronicagg]

@vishrutshah question: the change that's marked as reverted above, takes me automatic PR
#934 that comes from Azure/azure-rest-api-specs#1574 This PR doesn't seem to contain the ResourceUpdate changes, what am I missing?

[vishrutshah]

@veronicagg That's a right question but as i was just making commits to unblock my task this PR appears here. Could you please reivew https://github.com/Azure/azure-sdk-for-ruby/pull/959/files#diff-12caea728ed994cf224b6432d02d995eR11 first and see if I missed anything here. If i missed it should be there as well. Thanks!

[veronicagg]

Rest looks good to me. Could you update our instructions on the release process? now that we have the Autorest.Ruby repo?

[vishrutshah]

Below is the remaining checklist for me:

• Incorporate change [compute] Removing x-ms-azure-resource extension from invalid model ResourceUpdate azure-rest-api-specs#1658 (comment) into azure_mgmt_comput gem
• Update changelog
• Update release process documentation w.r.t AutoRest.Ruby generator

[veronicagg]

LGTM

[vishrutshah]

Thanks for the review!! I'll wait for @sarangan12 to go over this as well to make sure things looks good.

[sarangan12]

LGTM

[vishrutshah]

Thanks @sarangan12 for taking a look.