Unexport a few things from device.
Unexport a few things from device.

These are Unexported in the gfmedia, but not
fakecpe, and when traversing the tree in
GetCanonicalName, throws an exception since there
is no implementation.

Change-Id: I8aac76b464e71a9ca6f1a8732ed35a24502d5570

shineyear/catawampus,ankurjimmy/catawampus,pombredanne/catawampus,pombredanne/catawampus,ultilix/catawampus,ankurjimmy/catawampus,shineyear/catawampus,ultilix/catawampus