The Windows Subsystem for Linux is not a complete implementation
of the Linux APIs, and setting TCP_KEEPCNT is currently
unimplmenented. Attempting to use this option will cause HTTP
connections to fail. This change checks if we are running under
WSL, and disables changing TCP_KEEPCNT parameters if so.
Change-Id: Ic8b41dea2a75660d9adbce88a00a0fe703a4d120
Closes-Bug: #1614688