Create public macros for ssl_ticket key,name sizes

Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
diff --git a/library/ssl_ticket.c b/library/ssl_ticket.c
index e410b6b..b04e184 100644
--- a/library/ssl_ticket.c
+++ b/library/ssl_ticket.c
@@ -48,9 +48,9 @@
 #endif
 }
 
-#define MAX_KEY_BYTES 32    /* 256 bits */
+#define MAX_KEY_BYTES           MBEDTLS_SSL_TICKET_MAX_KEY_BYTES
 
-#define TICKET_KEY_NAME_BYTES    4
+#define TICKET_KEY_NAME_BYTES   MBEDTLS_SSL_TICKET_KEY_NAME_BYTES
 #define TICKET_IV_BYTES         12
 #define TICKET_CRYPT_LEN_BYTES   2
 #define TICKET_AUTH_TAG_BYTES   16