Integration test tweaks

Wait for more than 1 second on podman info to complete.  Also, add
clarification to why slirp fails.

Signed-off-by: baude <bbaude@redhat.com>

libpod/networking_linux.go

@@ -215,9 +215,12 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
 				if pid != cmd.Process.Pid {
 					continue
 				}
-				if status.Exited() || status.Signaled() {
+				if status.Exited() {
 					return errors.New("slirp4netns failed")
 				}
+				if status.Signaled() {
+					return errors.New("slirp4netns killed by signal")
+				}
 				continue
 			}
 			return errors.Wrapf(err, "failed to read from slirp4netns sync pipe")