virt-launcher: decrease timeout for http get when detecting Istio

The 10 second timeout is too long and may cause the launcher to
not terminate for longer than necessary.
Shortening the timeout to 2 seconds for http get requests, which
should be more than enough.

With this change, in the worst case scenario, the detection would
take at most 8 seconds (4*2) plus a few ms jitter.

Signed-off-by: Radim Hrazdil <[email protected]>

cmd/virt-launcher/virt-launcher.go

@@ -65,7 +65,7 @@ import (
 )
 
 const defaultStartTimeout = 3 * time.Minute
-const httpRequestTimeout = 10 * time.Second
+const httpRequestTimeout = 2 * time.Second
 
 func init() {
 	// must registry the event impl before doing anything else.