[#1415] Added todo for MT in new classes

FreeLeaseQueue and IPRangePermutation.

Author: msiodelski

src/lib/dhcpsrv/free_lease_queue.h

@@ -76,6 +76,9 @@ namespace dhcp {
 /// certain ranges it is important that this container can efficiently identify
 /// the range. Once the range is identified, the reclaimed lease is appended to
 /// the end of the queue for that range.
+///
+/// @todo Methods of this class should be called in thread safe context. Otherwise
+/// they should be made thread safe.
 class FreeLeaseQueue {
 public:
 

src/lib/dhcpsrv/ip_range_permutation.h

@@ -60,6 +60,9 @@ namespace dhcp {
 /// This algorithm guarantees that all IP addresses or delegated prefixes
 /// beloging to the given  range are returned and no duplicates are returned.
 /// The addresses or delegated prefixes are returned in a random order.
+///
+/// @todo Methods of this class should be called in thread safe context. Otherwise
+/// they should be made thread safe.
 class IPRangePermutation {
 public: