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/host-cmd-manager.cpp b/host-cmd-manager.cpp
index 90e932b..4084910 100644
--- a/host-cmd-manager.cpp
+++ b/host-cmd-manager.cpp
@@ -1,12 +1,14 @@
-#include <config.h>
-#include <systemintfcmds.h>
+#include "config.h"
+
+#include "host-cmd-manager.hpp"
+
+#include "systemintfcmds.hpp"
+#include "timer.hpp"
+#include "utils.hpp"
 
 #include <chrono>
-#include <host-cmd-manager.hpp>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>
-#include <timer.hpp>
-#include <utils.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 #include <xyz/openbmc_project/State/Host/server.hpp>