[Hotfix 4.0.2] | Fix hang on infinite timeout and managed SNI (#1742)#1747

DavoudEshtehari merged 3 commits intodotnet:4.0-servicingdotnet/SqlClient:4.0-servicingfrom

DavoudEshtehari:Backport/4.0.2-FixTimeoutDavoudEshtehari/SqlClient:Backport/4.0.2-FixTimeoutCopy head branch name to clipboard