This commit includes:
- Support for ip_start, ip_end parameters when creating ranged vnetworks.
- Removal of the add lease/remove lease dialogs.
- Renewal of the representation of leases pool in the "extended information" windows. The list of leases is represented so that it is clearly visible those leases which are free, on hold (reserved), or used by a VM. Right on the list, leases can be added, updated or deleted.
(cherry picked from commit eccae0e73126d5571cd138a782d5ba0e58aa0e22)