Add ethervgbe driver (thanks to Philippe Anel).
Remove unused T control message in uart.
 [jmk] --rw-rw-r-- M 1185876 jmk sys 26558 Jan 24 09:54 sys/src/9/pc/ethervgbe.c
 [rsc] --rw-rw-r-- M 1185876 glenda sys 12141 Jan 24 11:08 sys/src/9/port/devuart.c
	/n/sourcesdump/2006/0124/plan9/sys/src/9/port/devuart.c:458,467 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/port/devuart.c:458,463
	  			if((*p->phys->stop)(p, n) < 0)
	  				return -1;
	  			break;
	- 		case 'T':
	- 		case 't':
	- 			p->dcdts = n;
	- 			break;
	  		case 'W':
	  		case 'w':
	  			if(uarttimer == nil || n < 1)
 [rsc] --rw-rw-r-- M 1185876 glenda sys 22540 Jan 24 13:27 sys/src/9/port/portdat.h
	/n/sourcesdump/2006/0124/plan9/sys/src/9/port/portdat.h:888,894 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/port/portdat.h:888,894
	  	int	modem;			/* hardware flow control on */
	  	int	xonoff;			/* software flow control on */
	  	int	blocked;
	- 	int	cts, dsr, dcd, dcdts;	/* keep track of modem status */ 
	+ 	int	cts, dsr, dcd;	/* keep track of modem status */ 
	  	int	ctsbackoff;
	  	int	hup_dsr, hup_dcd;	/* send hangup upstream? */
	  	int	dohup;
 [jmk] --rw-rw-r-- M 1185876 glenda sys 1452 Jan 24 10:07 sys/src/9/pc/pc
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pc:53,58 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pc:53,59
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	ethervt6102	pci ethermii
	  	ethersink
	  	ethersmc	devi82365 cis
 [jmk] --rw-rw-r-- M 1185876 glenda sys 891 Jan 24 10:07 sys/src/9/pc/pccpu
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pccpu:41,46 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pccpu:41,47
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	ethervt6102	pci ethermii
	  	ethersink
	  	ethermedium
 [jmk] --rw-rw-r-- M 1185876 glenda sys 1471 Jan 24 10:07 sys/src/9/pc/pcdisk
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pcdisk:50,55 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pcdisk:50,56
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	ethervt6102	pci ethermii
	  	ethersink
	  	ethersmc	devi82365 cis
 [jmk] --rw-rw-r-- M 1185876 presotto sys 1529 Jan 24 10:07 sys/src/9/pc/pcf
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pcf:52,57 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pcf:52,58
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	ethervt6102	pci ethermii
	  	ethersink
	  	ethersmc	devi82365 cis
 [jmk] --rw-rw-r-- M 1185876 glenda sys 1451 Jan 24 10:07 sys/src/9/pc/pccd
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pccd:52,57 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pccd:52,58
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	etherga620	pci
	  	ethersink
	  	ethersmc	devi82365 cis
 [jmk] --rw-rw-r-- M 1185876 presotto sys 1511 Jan 24 10:07 sys/src/9/pc/pccpuf
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pccpuf:49,54 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pccpuf:49,55
	  	etherelnk3	pci
	  	etherga620	pci
	  	etherigbe	pci ethermii
	+ 	ethervgbe	pci ethermii
	  	ethervt6102	pci ethermii
	  	ethersink
	  	ethersmc	devi82365 cis
 [jmk] --rw-rw-r-- M 1185876 rsc sys 1498 Jan 24 10:07 sys/src/9/pc/pcflop
	/n/sourcesdump/2006/0124/plan9/sys/src/9/pc/pcflop:51,56 - 
	/n/sourcesdump/2006/0125/plan9/sys/src/9/pc/pcflop:51,57
	  	etherec2t	ether8390
	  	etherelnk3	pci
	  	etherga620	pci
	+ 	ethervgbe	pci ethermii
	  	etherigbe	pci ethermii
	  	ethervt6102	pci ethermii
	  #	ethersink
 [rsc] --rw-rw-r-- M 1185876 glenda sys 12141 Jan 24 11:08 sys/src/9/port/devuart.c
 [rsc] --rw-rw-r-- M 1185876 glenda sys 22540 Jan 24 13:27 sys/src/9/port/portdat.h