rocshmem_config.h has a different include path when installed and built-dir (#186)

* rocshmem_config.h needs to be in a similar directory structure for
includes to work when building testers in build, and from an installed
library

* Do not change installed rocshmem.hpp

src/host/host.cpp

@@ -26,7 +26,7 @@
 
 #include <mpi.h>
 
-#include "rocshmem_config.h"  // NOLINT(build/include_subdir)
+#include "rocshmem/rocshmem_config.h"  // NOLINT(build/include_subdir)
 #include "host_helpers.hpp"
 #include "../memory/window_info.hpp"
 #include "../util.hpp"

src/host/host_templates.hpp

@@ -25,7 +25,7 @@
 #ifndef LIBRARY_SRC_HOST_HOST_TEMPLATES_HPP_
 #define LIBRARY_SRC_HOST_HOST_TEMPLATES_HPP_
 
-#include "rocshmem_config.h"  // NOLINT(build/include_subdir)
+#include "rocshmem/rocshmem_config.h"  // NOLINT(build/include_subdir)
 #include "host_helpers.hpp"
 #include "../memory/window_info.hpp"
 #include "../team.hpp"