[9.000][FEATURE] Show the status of reservation in DHCP

There should be a status window, stating the amount of available ips in scope, the amount of ips used and the total amount.

BUG: When cleaning the DHCL Lease (/var/chroot-dhcps/var/state/dhcp/dhcpd.leases), if defined as static ips, ips will again be distributed by the scope - ip conflicts occurring.