This passes through the container hostname to HCS, which in Windows Server 2016 TP4 will set the container's hostname in the registry before starting it. This will be silently ignored by TP3. Signed-off-by: John Starks <jostarks@microsoft.com> Upstream-commit: 7e8c92ad72aecda178c41dbe7e1aa9269be39d5d Component: engine