Implemented close session cmd in host interface

This command can close any session via host interface.

Tested:

Close the existing valid session by session id
ipmitool raw 0x6 0x3c <valid sesssion id >
Response : 00  // success

Close the existing valid session by session handle
ipmitool raw 0x6 0x3c <zero session id> <valid session handle>
Response : 00  // success

Close the session by zero session id
ipmitool raw 0x6 0x3c <zero session id>
Response : 0x87  // inavlid session id

Close the session by zero session handle
ipmitool raw 0x6 0x3c <zero session id> <zero session handle>
Response : 0x88  // inavlid session handle

Close an inactive session.
ipmitool raw 0x6 0x3c <valid session id>
Response : 0xcc  // invalid data field in request

Close an inactive session.
ipmitool raw 0x6 0x3c <zero session id> <valid session hnadle>
Response : 0xcc  // invalid data field in request

Signed-off-by: Rajashekar Gade Reddy <raja.sekhar.reddy.gade@linux.intel.com>
Change-Id: I8af290001d8effbbcdbbe2dd93aabf1b015e7a88
diff --git a/include/Makefile.am b/include/Makefile.am
index 996c41a..08824c4 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -2,6 +2,7 @@
 	ipmid/api.hpp \
 	ipmid/api-types.hpp \
 	ipmid/sessiondef.hpp \
+	ipmid/sessionhelper.hpp \
 	ipmid/filter.hpp \
 	ipmid/handler.hpp \
 	ipmid/message.hpp \