Adding support for MySQL and PG migrations (Azure#17847)

* Adding PostgreSQL properties for PGV2 as well as table selection and Xinghao's NIC change

* Adding tests

* Undoing change to avoid CRLF/LF file changes

* Re-running generate.ps1

Co-authored-by: Artyom Pavlichenko <arpavlic@microsoft.com>

Author: temandr

eng/mgmt/mgmtmetadata/datamigration_resource-manager.txt

@@ -1,14 +1,14 @@
-Installing AutoRest version: latest
+Installing AutoRest version: v2
 AutoRest installed successfully.
 Commencing code generation
 Generating CSharp code
 Executing AutoRest command
-cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/datamigration/resource-manager/readme.md --csharp --version=latest --reflect-api-versions --csharp-sdks-folder=C:\Dev\Git\azure-sdk-for-net\sdk
-2019-10-15 23:51:19 UTC
+cmd.exe /c autorest.cmd https://github.com/Azure/azure-rest-api-specs/blob/master/specification/datamigration/resource-manager/readme.md --csharp --version=v2 --reflect-api-versions --csharp-sdks-folder=E:\forks\azure-sdk-for-net\sdk
+2021-01-21 02:28:11 UTC
 Azure-rest-api-specs repository information
 GitHub fork: Azure
 Branch:      master
-Commit:      411d4cf447639289e4ee1efa4d066df2773ebccd
+Commit:      10f3923e845911a8c39bba966b0e9177301cd794
 AutoRest information
-Requested version: latest
-Bootstrapper version:    autorest@2.0.4283
+Requested version: v2
+Bootstrapper version:    autorest@2.0.4413