Dlmglue is built on top of this. Bring in the portions we need which
includes the stackglue API as well as most of the fs/dlm implementation.
I left off the Ocfs2 specific version and connection handling. Also
left out is the old Ocfs2 dlm support which we'll never want.
Like dlmglue, we keep as much of the generic stackglue code in tact
here. This will make translating to/from upstream patches much easier.
Signed-off-by: Mark Fasheh <mfasheh@versity.com>