Add new config MBEDTLS_SSL_SESSION_RESUMPTION

Add a new configuration option MBEDTLS_SSL_SESSION_RESUMPTION
to enable/disable the session resumption feature including
ticket and cache based session resumption.
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 81c1340..7ceccee 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1677,6 +1677,14 @@
 #define MBEDTLS_SSL_SESSION_CACHE
 
 /**
+ * \def MBEDTLS_SSL_SESSION_RESUMPTION
+ *
+ *
+ * Comment this macro to disable support for SSL session resumption
+ */
+#define MBEDTLS_SSL_SESSION_RESUMPTION
+
+/**
  * \def MBEDTLS_SSL_EXPORT_KEYS
  *
  * Enable support for exporting key block and master secret.