Merge pull request dotnet/corefx#29697 from AfsanehR/PoolBlockingPeriod

Added PoolBlockingPeriod connection property

Commit migrated from https://github.com/dotnet/corefx/commit/f487a4c84e6ea02d053fd22546720194b63c8106

diff --cc src/libraries/System.Data.SqlClient/src/System.Data.SqlClient.csproj
Simple merge

diff --cc src/libraries/System.Data.SqlClient/src/System/Data/Common/DbConnectionStringCommon.cs
Simple merge

diff --cc src/libraries/System.Data.SqlClient/src/System/Data/ProviderBase/DbConnectionPool.cs
Simple merge

diff --cc src/libraries/System.Data.SqlClient/src/System/Data/SqlClient/SqlConnectionString.cs
Simple merge

diff --cc src/libraries/System.Data.SqlClient/tests/ManualTests/System.Data.SqlClient.ManualTesting.Tests.csproj
Simple merge

diff --cc src/libraries/pkg/Microsoft.Private.PackageBaseline/packageIndex.json
Simple merge