Set a static HEAT_AUTH_ENC_KEY of 16 chars
Set a static HEAT_AUTH_ENC_KEY of 16 chars

Error: 8 is not a correct size for auth_encryption_key parameter, it
must be either 16, 24, 32 bytes long.

Change-Id: I1e6b25a848a1fc7e4c7e2b9568078fdd4767b43f

sasukeh/packstack-vagrant,sasukeh/packstack-vagrant