Update default configuration

Change the default settings for SSL and modify the tests accordingly.
diff --git a/ChangeLog b/ChangeLog
index c153a7b..f3e6d1d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@
    * On ARM platforms, when compiling with -O0 with GCC, Clang or armcc5,
      don't use the optimized assembly for bignum multiplication. This removes
      the need to pass -fomit-frame-pointer to avoid a build error with -O0.
+   * Disabled SSLv3 in the default configuration.
 
 = mbed TLS 1.3.16 released 2016-01-05