kern/67545: [nfs] NFS Diskless Mount Option Suggestion

[Brooks Davis]

As of 6.3, you should be able to do this via the bootp/dhcp site option 130.
With a recent ISC dhcpd, you do:

# This must be outside any {}'s
option freebsd-nfsroot-opts code 130 = string;
# This can be anywhere
option freebsd-nfsroot-opts "rsize=32768,wsize=32768,tcp,nolockd";

Being able to compile in a default string or set one via kenv does seem
somewhat useful, but this feature should be sufficent in many cases.

-- Brooks
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