Fixes Heat AES Key Error
Fixes Heat AES Key Error

Previously, the default key was not long enough for Heat's
key length requirements:

ERROR: AES key must be either 16, 24, or 32 bytes long

The default key is now the same as the default in heat.conf.

Change-Id: I1b02cd87b97916800a0a0f5590313a717c2401c9

phchoic/puppet_openstack_builder,michaeltchapman/puppet_openstack_builder,CiscoSystems/puppet_openstack_builder,michaeltchapman/vagrant-consul,CiscoSystems/puppet_openstack_builder,phchoic/puppet_openstack_builder,michaeltchapman/puppet_openstack_builder,michaeltchapman/vagrant-consul,michaeltchapman/puppet_openstack_builder,phchoic/puppet_openstack_builder