server: fix global setting system.vm.public.ip.reservation.mode.strictness is not really dynamic (#7909)

If the original value is `false`, and search build is configured without the condition. Now change the value to `true`, it will not get effective due to missing condition.

Author: weizhouapache

server/src/main/java/com/cloud/network/IpAddressManagerImpl.java

@@ -496,9 +496,8 @@ public boolean configure(String name, Map<String, Object> params) {
         AssignIpAddressSearch.and("dc", AssignIpAddressSearch.entity().getDataCenterId(), Op.EQ);
         AssignIpAddressSearch.and("allocated", AssignIpAddressSearch.entity().getAllocatedTime(), Op.NULL);
         AssignIpAddressSearch.and("vlanId", AssignIpAddressSearch.entity().getVlanId(), Op.IN);
-        if (SystemVmPublicIpReservationModeStrictness.value()) {
-            AssignIpAddressSearch.and("forSystemVms", AssignIpAddressSearch.entity().isForSystemVms(), Op.EQ);
-        }
+        AssignIpAddressSearch.and("forSystemVms", AssignIpAddressSearch.entity().isForSystemVms(), Op.EQ);
+
         SearchBuilder<VlanVO> vlanSearch = _vlanDao.createSearchBuilder();
         vlanSearch.and("type", vlanSearch.entity().getVlanType(), Op.EQ);
         vlanSearch.and("networkId", vlanSearch.entity().getNetworkId(), Op.EQ);