Use service_ports_number option to calculate number of used ips

After subnet is created, ips can be assigned also to neutron service ports.
For example portprober agent service cannot be disabled via API like
DHCP, so when cheking used ips these ports should be taken into account
after each subnet creation.

Change-Id: I25dbc6f2717b017c2f51d7608dd9cafaa377550a
Depends-On: I089bc013188079289914d98fd24cbfd3c4d91530
Related-Prod: https://mirantis.jira.com/browse/PRODX-42203
1 file changed