Add description to floating IPs.

Created by: garloff

The tagging is not as reliable as we'd need it to be :-( So put a description to floating IPs in addition. This could be used to automatically clean them up from time to time. (This cleanup is not yet implemented.)

Note: There were a few neutron floating-ip-XXX commands in the source file (with XXX = create, list, delete). These won't work, as they need to be written floatingip-XXX. This was harmless thus far, as we typically translate these commands into openstack CLI commands (where they become openstack floating ip XXX) and the translator was tolerant against the extra dash. This was corrected.

Signed-off-by: Kurt Garloff kurt@garloff.de