Reduce time spent sleeping in the e2e tests

Instead of sleeping one second, we should reduce this time to one
millisecond so that we are checking more often but also likely moving on
to the next message faster. This will significantly reduce the amount of
time we spend in our e2e tests.

Signed-off-by: Remy Suen <remy.suen@docker.com>

Author: rcjsuen

e2e-tests/initialize_test.go

@@ -46,7 +46,7 @@ func (ts *TestStream) Read(b []byte) (int, error) {
 		} else if err != io.EOF {
 			return r, err
 		}
-		time.Sleep(1 * time.Second)
+		time.Sleep(1 * time.Millisecond)
 	}
 }