split parameters for logging and tuning

add a flag to enable/disable tuning: default off
add an option for specifying a folder for outputting logs.

Closes: #10
Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I43864768f1dee8672f13288d3cf5a0c87c373aed
diff --git a/pid/zone.hpp b/pid/zone.hpp
index 78ebf0f..fcadac0 100644
--- a/pid/zone.hpp
+++ b/pid/zone.hpp
@@ -52,9 +52,9 @@
         _minThermalOutputSetPt(minThermalOutput),
         _failSafePercent(failSafePercent), _mgr(mgr)
     {
-        if (tuningLoggingEnabled && !tuningLoggingPath.empty())
+        if (loggingEnabled)
         {
-            _log.open(tuningLoggingPath + std::to_string(zone));
+            _log.open(loggingPath + std::to_string(zone));
         }
     }