Fix build breakage due to SSLDefaultConfigurationAsserts rename.

libcore's SSLDefaultConfigurationAsserts was renamed and refactored
into SSLConfigurationAsserts in
782740701db73dd2dc4fef9df8cde270b0e631a4. This CL adjusts the
affected CTS test for android.net.SSLCertificateSocketFactory
accordingly.

Change-Id: I663042e7c08ad616b2dedc226acda54c95fd6968