This object sdpBindMeshTlsNotInMstRegion indicates whether
we received a BPDU from another MST-region on this mesh
SDP.
If set to 'true' then the object sdpBindMeshTlsHoldDownTimer
will have the value 'active'.
It is up to the operator to make sure bridges connected
via mesh SDPs are in the same MST-region. If not the mesh
will NOT become operational.