[MWF] Fix crash from null control in ContainerControl (#10537)
Merge pull request #955 from ermshiperete/bug-xamarin-10537

[MWF] Fix crash from null control in ContainerControl (#10537)
[corlib] Set test failure when test hangs
[corlib] Add SortVersion. Fixes #18770
[Http]: Remove chunked/etc headers when redirecting a request as GET.
[Http]: Clear the 'SendChunked' flag when redirecting.
[Http]: Disable redirect with body and no buffering.
[System.Core] Exclude legacy visitor in new profiles
[docs] Fixed XML syntax issue with CipherSuitsCallback, and ServicePointManager xml files.
docimport: Initial Import pass of Microsoft's Creative Commons BCL Documentation