diskless nfs root via TCP

[Mike Andrews]

What are the chances I can beg someone to merge the RELENG_7 version of 
sys/nfsclient/nfs_diskless.c into RELENG_6 before the release(s)?  :)

It would be helpful for one of my clients to be able to force a TCP mount 
of the root filesystem on their diskless systems instead of UDP.  Unless 
I'm missing something obvious (which is somewhere between "possible" and 
"highly likely"...) I don't currently see a way to do that in RELENG_6; 
using the T option in the root fstab entry seems to be ignored.