Conscrypt: Fix renegotiation-based tests

BoringSSL no longer supports on-demand renegotiation, so tests that
are based on that cannot pass.  Change one test to confirm that,
and remove the other.

Bug: 21876068
Bug: 21875889
Test: cts -m CtsLibcoreTestCases -t com.android.org.conscrypt.NativeCryptoTest
Change-Id: I8b80a0567b6cae11b58b11c78581498d216d92fa
1 file changed