conf change: rename zone variables

Rename the zone variables to make them camelCase as a step towards
making all configuration variables camelCase for consistency.

Note: This patchset requires a change to your yaml configuration if
you're using it, or libconfig if you're using it.

Change-Id: If9cf1d7eb8227d305a1625275f2f7082c0d6905a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/conf.hpp b/conf.hpp
index c251efc..c5734cc 100644
--- a/conf.hpp
+++ b/conf.hpp
@@ -46,10 +46,10 @@
 struct ZoneConfig
 {
     /* The minimum RPM value we would ever want. */
-    double minthermalrpm;
+    double minThermalRpm;
 
     /* If the sensors are in fail-safe mode, this is the percentage to use. */
-    double failsafepercent;
+    double failsafePercent;
 };
 
 using PIDConf = std::map<std::string, struct ControllerInfo>;