sensors/zones: place in namespace and cleanup

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I527dbc8477a232945f696227a7b0b2adbee45175
diff --git a/dbus/dbusactiveread.cpp b/dbus/dbusactiveread.cpp
index 406b391..21f6c4d 100644
--- a/dbus/dbusactiveread.cpp
+++ b/dbus/dbusactiveread.cpp
@@ -22,6 +22,9 @@
 #include <cmath>
 #include <iostream>
 
+namespace pid_control
+{
+
 ReadReturn DbusActiveRead::read(void)
 {
     struct SensorProperties settings;
@@ -39,3 +42,5 @@
 
     return r;
 }
+
+} // namespace pid_control