Move HAS_NEW_BUFFER definition to common headers. LP:1256172.
Buffer/bytearray support for Galois. LP:1256172.
Buffer/bytearray support for strxor. LP:1256172.
Tests for bytearray usage in ciphers. LP:1256172.
Fix bytearray usage with MACs. LP:1256172
Fix bytearray usage with nonces. LP:1256172