Revert "Allow the use of ROS_ETC_DIR to control the placement of the (#…

…551)"

This reverts commit dadfd0a.

src/rosdep2/sources_list.py

@@ -96,7 +96,11 @@ def get_sources_list_dirs(source_list_dir):
 def get_sources_list_dir():
     # base of where we read config files from
     # TODO: windows
-    etc_ros = rospkg.get_etc_ros_dir()
+    if 0:
+        # we can't use etc/ros because environment config does not carry over under sudo
+        etc_ros = rospkg.get_etc_ros_dir()
+    else:
+        etc_ros = '/etc/ros'
     # compute default system wide sources directory
     sys_sources_list_dir = os.path.join(etc_ros, 'rosdep', SOURCES_LIST_DIR)
     sources_list_dirs = get_sources_list_dirs(sys_sources_list_dir)