catkin: adding pkgutil run dependency

Resolves import error in __init__.py files derived from catkin/cmake/templates/__init__.py.in template,
e.g. in tf:
  File "/usr/lib/python2.7/site-packages/tf/__init__.py", line 7, in <module>
    from pkgutil import extend_path
ImportError: No module named pkgutil

recipes-ros/catkin/catkin_0.5.85.bb

@@ -26,6 +26,6 @@ FILES_${PN}-dev += "\
 RDEPENDS_${PN}_class-native = ""
 RDEPENDS_${PN} = "cmake make binutils binutils-symlinks gcc gcc-symlinks g++ g++-symlinks \
     python-catkin-pkg python-argparse python-misc python-multiprocessing \
-    python-shell python-subprocess python-xml"
+    python-shell python-subprocess python-xml python-pkgutil"
 
 BBCLASSEXTEND += "native"