Allow more time for containerd to start for integration

Currently hardcoded to 2 seconds; in GitHub actions we see random
cancellation of our integration suite right at 2 seconds even
though containerd is within milliseconds of being ready.

Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>

client_test.go

@@ -108,7 +108,7 @@ func TestMain(m *testing.M) {
 		}
 	}
 
-	waitCtx, waitCancel := context.WithTimeout(ctx, 2*time.Second)
+	waitCtx, waitCancel := context.WithTimeout(ctx, 4*time.Second)
 	client, err := ctrd.waitForStart(waitCtx)
 	waitCancel()
 	if err != nil {