MFC r256557 - kernel and userland osreldate helpers.
MFC r257600:
Initialize the struct tm before handing it to strptime(3).
MFC: r261584

In IPv6 code examples, use the correct v6 socket.
MFC: r261838

Add a deprecation notice to nve.4 and Xref nfe.4.
Direct commit to stable/8 to note that the nve(4) driver has been
deprecated.