openstack-dashboard should suggest python-lesscpy

Upstream horizon commit at [1] dropped requirement on less.js in favor of python-lesscpy. Upstream MP at [2] specifically says "still waiting on ubuntu package".

As packaged in ubuntu and debian, 'lesscpy' binary is only available in 'python3-lesscpy' package.

In order to support upstream's ci that wants to use lesscpy from cloud archive, we're interested in uploading it to the cloud archive.
However, we don't really want to have packages (other than "top level" openstack packages) in the cloud archive that are not dependencies.

I'm not sure how best to address this really. One suggestion (as in the title here) is to 'Suggests' the python3-lesscpy package from openstack-dashboard. Then, at least we have *some* link as to why this package is being added.

[1] https://github.com/openstack/horizon/commit/a0739c9423a4c559b45af96fa4cdb30539dcdbd7
[2] https://review.openstack.org/#/c/40218/

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: openstack-dashboard 1:2013.2~b3-0ubuntu1
ProcVersionSignature: User Name 3.11.0-7.14-generic 3.11.1
Uname: Linux 3.11.0-7-generic x86_64
ApportVersion: 2.12.1-0ubuntu4
Architecture: amd64
Date: Tue Sep 17 15:47:52 2013
Ec2AMI: ami-000004e5
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.tiny
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: horizon
UpgradeStatus: No upgrade log present (probably fresh install)