ocsp: fix test on TZ=UTC systems

If the system is using UTC, then time.Now().loc != time.UTC().loc,
so it should not use reflect.DeepEqual to compare two times.

While we're here, also fix some copy-paste errors.

Change-Id: I1fef5f22f5b5eb978746d2695a1b43f153e4a408
Reviewed-on: https://go-review.googlesource.com/10335
Reviewed-by: Adam Langley <agl@golang.org>