Check_MK Werk 2833: isc_dhcpd, win_dhcp_pools: lower levels for used dhcp leases are now configurable

ID: 2833 Title: isc_dhcpd, win_dhcp_pools: lower levels for used dhcp leases are now configurable Component: Checks & Agents Level: 1 Class: New Feature Version: 1.2.7i4 Lower levels for free and used dhcp leases are now configurable. Moreover these levels can be configured as percent or absolute values.