rename headers to match style

Moving headers from ".h" to ".hpp"

Reworked the header inclusion a bit so that host-ipmid is treated as a
library, and local headers aren't.

renamed apphandler.h => apphandler.hpp
renamed chassishandler.h => chassishandler.hpp
renamed globalhandler.h => globalhandler.hpp
renamed sensorhandler.h => sensorhandler.hpp
renamed storageaddsel.h => storageaddsel.hpp
renamed storagehandler.h => storagehandler.hpp
renamed systemintfcmds.h => systemintfcmds.hpp

Change-Id: I9d4ce3dd57e2e996800f9020a10cc10cdf2c3914
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/testaddsel.cpp b/testaddsel.cpp
index 7f42acb..e44ecb7 100644
--- a/testaddsel.cpp
+++ b/testaddsel.cpp
@@ -1,3 +1,5 @@
+#include "sensorhandler.hpp"
+
 #include <errno.h>
 #include <limits.h>
 #include <mapper.h>
@@ -6,8 +8,6 @@
 #include <stdlib.h>
 #include <systemd/sd-bus.h>
 
-#include "sensorhandler.h"
-
 extern void send_esel(uint16_t recordid);
 
 sd_bus* bus = NULL;