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ip/dhcpd: add rootserverip read in lookupip() (thanks k0ga)

Lookupip() was already reading rootpath, but it didn't read the
address of the rootserver.  As they are very related it makes sense to
read them at the same time.

This patch also fixes a typo, where vendorclass was used instead of
vendor, resulting that vendor ndb attribute was never used.

--- a/sys/src/cmd/ip/dhcpd/dat.h

+++ b/sys/src/cmd/ip/dhcpd/dat.h

@@ -42,6 +42,7 @@

 	uchar	gwip[NDB_IPlen];	/* gateway ip address */

 	uchar	fsip[NDB_IPlen];	/* file system ip address */

 	uchar	auip[NDB_IPlen];	/* authentication server ip address */

+	uchar   rootserverip[NDB_IPlen];  /* ip addr of root nfs server  */

 	char	rootpath[Maxstr];	/* rootfs for diskless nfs clients */

 	char	dhcpgroup[Maxstr];

 	char	vendor[Maxstr];		/* vendor info */

--- a/sys/src/cmd/ip/dhcpd/ndb.c

+++ b/sys/src/cmd/ip/dhcpd/ndb.c

@@ -116,10 +116,11 @@

 		*p++ = "@tftp2";

 		*p++ = "rootpath";

 		*p++ = "dhcp";

-		*p++ = "vendorclass";

+		*p++ = "vendor";

 		*p++ = "dom";

 		*p++ = "@fs";

 		*p++ = "@auth";

+		*p++ = "@rootserver";

 	}

 	if(hwattr != nil)

 		*p++ = hwattr;

@@ -152,6 +153,9 @@

 		else

 		if(strcmp(nt->attr, "ipgw") == 0)

 			setipaddr(iip->gwip, nt->val);

+		else

+		if(strcmp(nt->attr, "rootserver") == 0)

+			setipaddr(iip->rootserverip, nt->val);

 		else

 		if(strcmp(nt->attr, "dhcp") == 0){

 			if(iip->dhcpgroup[0] == 0)