control: Display locked targets in debug dump

The override_fan_target action can lock individual fan targets to a
value that is different than the zone target that the rest of the fans
are set to.

This change adds those locked target values to the 'zones' section of
the debug dump:

    "target_locks": {
        "fan0": [
            11300
        ],
        "fan3": [
            11300
        ]
    }

And when there are no locks:

    "target_locks": {}

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I2c4cfa317028db8843d361e79b270d612aacdd87

Author: spinler

control/json/fan.hpp

@@ -110,6 +110,16 @@ class Fan : public ConfigBase
      */
     void setTarget(uint64_t target);
 
+    /**
+     * @brief Returns the fan's locked targets.
+     *
+     * @return - vector of locked targets
+     */
+    const std::vector<uint64_t>& getLockedTargets() const
+    {
+        return _lockedTargets;
+    }
+
   private:
     /**
      * Forces all contained sensors to the target (if this target is the

control/json/zone.cpp

@@ -535,6 +535,17 @@ json Zone::dump() const
     output["target_holds"] = _targetHolds;
     output["floor_holds"] = _floorHolds;
 
+    std::map<std::string, std::vector<uint64_t>> lockedTargets;
+    for (const auto& fan : _fans)
+    {
+        const auto& locks = fan->getLockedTargets();
+        if (!locks.empty())
+        {
+            lockedTargets[fan->getName()] = locks;
+        }
+    }
+    output["target_locks"] = lockedTargets;
+
     return output;
 }