Add haproxy package override option.
Add haproxy package override option.

Because HAProxy 1.5 now supports SSL we can reduce
complexity by using that instead of an additional
service. Since it's not in any official el6 repos
this patch allows specifying a url from which to
download the rpm.

michaeltchapman/puppet-stacktira,michaeltchapman/puppet-stacktira,michaeltchapman/puppet-openstacklib,michaeltchapman/puppet-openstacklib