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/globalhandler.cpp b/globalhandler.cpp
index 55761b4..61a2a80 100644
--- a/globalhandler.cpp
+++ b/globalhandler.cpp
@@ -1,16 +1,16 @@
-#include "globalhandler.h"
+#include "globalhandler.hpp"
 
+#include "utils.hpp"
+
+#include <host-ipmid/ipmid-api.h>
 #include <stdio.h>
 
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>
 #include <string>
-#include <utils.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 #include <xyz/openbmc_project/State/BMC/server.hpp>
 
-#include "host-ipmid/ipmid-api.h"
-
 static constexpr auto bmcStateRoot = "/xyz/openbmc_project/state";
 static constexpr auto bmcStateIntf = "xyz.openbmc_project.State.BMC";
 static constexpr auto reqTransition = "RequestedBMCTransition";