Finally get this right: move orte_sys_info.[ch] back into the orte

tree.
- fix up #include's throughout the tree (yay contrib/search_replace.pl!)
- remove a few extraneous #include's
- remove orte_sys_info*() from opal_init()/opal_finalize() (it's
  already in orte_init_stage1() and orte_system_finalize())
- remove dependencies in opal on orte_system_info -- util/os_path.c
  and util/os_create_dirpath.c (they only used path_sep, anyway --
  easily changed to #defines)

This commit was SVN r7059.

test/util/opal_os_create_dirpath.c

@@ -30,7 +30,7 @@
 #include "support.h"
 #include "opal/runtime/opal.h"
 #include "opal/include/constants.h"
-#include "opal/util/sys_info.h"
+#include "orte/util/sys_info.h"
 #include "opal/util/os_path.h"
 #include "opal/util/os_create_dirpath.h"