Remove license checking on all non-nova tools.

The license checking does not belong in tools in the community
edition. This makes license checks less fragile, by shifting the
responsibility from each node to the node running cf-hub only.

At the same time, we deprecate the host_licenses_paid promise, it is
no longer needed to make this promise in either CFEngine version.

Fixes issue 2331.
Merge remote-tracking branch 'kacfengine/licenseCheckRemoval'