Normalize includes relative to source root

For unit test cases it is cleaner to have include file paths relative to
source root (e.g. #include attn/attn_handler.hpp).

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: Id718e57e9ba8da4c2ff3bb11b1c7a61537da538a
diff --git a/attn/attn_handler.cpp b/attn/attn_handler.cpp
index 6ea2fdc..e8684c6 100644
--- a/attn/attn_handler.cpp
+++ b/attn/attn_handler.cpp
@@ -1,12 +1,12 @@
 #include <libpdbg.h>
 
 #include <analyzer/analyzer_main.hpp>
-#include <attention.hpp>
-#include <attn_config.hpp>
-#include <attn_handler.hpp>
-#include <attn_logging.hpp>
-#include <bp_handler.hpp>
-#include <ti_handler.hpp>
+#include <attn/attention.hpp>
+#include <attn/attn_config.hpp>
+#include <attn/attn_handler.hpp>
+#include <attn/attn_logging.hpp>
+#include <attn/bp_handler.hpp>
+#include <attn/ti_handler.hpp>
 
 #include <algorithm>
 #include <iomanip>