Don't allow CCS just before CertificateVerify in DTLS.

This is the DTLS-side equivalent of 6553b379e2dbda9d03f6892f45fa97e4d8a37f04.

Change-Id: I5eb7f9d6d5030e375baa1406b00e3166d276dc84
Reviewed-on: https://boringssl-review.googlesource.com/3027
Reviewed-by: Adam Langley <agl@google.com>
1 file changed