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xen: gotta go fast

use smaller timeouts for sleeps while waiting for xen ether and sd devices to come online. in practice they come up very quickly.

--- a/sys/src/9/xen/etherxen.c

+++ b/sys/src/9/xen/etherxen.c

@@ -356,7 +356,7 @@

 	xenstore_gets(dir, "state", buf, sizeof buf);

 	while (strtol(buf, 0, 0) != XenbusStateConnected) {

 		print("etherxen: waiting for vif %d to connect\n", ctlr->vifno);

-		tsleep(&up->sleep, return0, 0, 1000);

+		tsleep(&up->sleep, return0, 0, 50);

 		xenstore_gets(dir, "state", buf, sizeof buf);

 	}

 }

--- a/sys/src/9/xen/sdxen.c

+++ b/sys/src/9/xen/sdxen.c

@@ -111,7 +111,7 @@

 	xenstore_gets(dir, "state", buf, sizeof buf);

 	while (strtol(buf, 0, 0) != XenbusStateConnected) {

 		print("sdxen: waiting for vbd %d to connect\n", ctlr->devid);

-		tsleep(&up->sleep, return0, 0, 1000);

+		tsleep(&up->sleep, return0, 0, 50);

 		xenstore_gets(dir, "state", buf, sizeof buf);

 	}

 	xenstore_gets(dir, "sector-size", buf, sizeof buf);

-- 

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