Set default pxeboot vfs.root.mountfrom to nfs?

[Garrett Cooper]

Hi Hackers,
    I realize this is a trivial patch, but it's a minor item that I
found kind of fascinating (and not thoroughly documented elsewhere
because many examples are booting mfsroots instead of directly booting
off nfs roots), but I'm proposing that pxeboot default to
vfs.root.mountfrom="nfs" to reduce the need for special case
loader.conf files just for pxe booting (and thus, enable
out-of-the-box netbooting ^o^!!!).
    Thoughts?
Thanks!
-Garrett
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