The variable "rabbitmq_erlang_distro_packages" was mis-named and should
have been "rabbitmq_distro_packages". This change simply corrects the
mistake.
Closes-Bug: #1704856
Change-Id: I0c9a6f3d4fad924a315fbd4fc0450419e258785f
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>