gms: added missing operator==() required for endpoint_state_map comparison.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>

gms/endpoint_state.hh

@@ -43,6 +43,13 @@ private:
     db_clock::time_point _update_timestamp;
     bool _is_alive;
 public:
+    bool operator==(const endpoint_state& other) const {
+        return _heart_beat_state  == other._heart_beat_state &&
+               _application_state == other._application_state &&
+               _update_timestamp  == other._update_timestamp &&
+               _is_alive          == other._is_alive;
+    }
+
     endpoint_state()
         : _heart_beat_state(0)
         , _update_timestamp(db_clock::now())

gms/heart_beat_state.hh

@@ -35,6 +35,10 @@ private:
     int32_t _generation;
     int32_t _version;
 public:
+    bool operator==(const heart_beat_state& other) const {
+        return _generation == other._generation && _version == other._version;
+    }
+
     heart_beat_state(int32_t gen)
         : _generation(gen)
         , _version(0) {

gms/versioned_value.hh

@@ -72,6 +72,11 @@ public:
     int version;
     sstring value;
 public:
+    bool operator==(const versioned_value& other) const {
+        return version == other.version &&
+               value   == other.value;
+    }
+
     versioned_value()
         : version(version_generator::get_next_version())
         , value("") {