HONEYCOMB-290 - Revert of presence removal

HONEYCOMB-290 - Revert of presence removal

Presence is actually needed here, otherwise both mandatory
leafs(table-id under vrf-subtable and bridge-domain-ref under
bridge-domain-subtable) are required, which is unnecessary
because sub-tables can be defined in any combination(none,one,both)

This will recreate bug described in HONEYCOMB-290 till
https://git.opendaylight.org/gerrit/#/c/48532/ is merged.
In the mean time, whole subtree request must be used

Change-Id: Id160888ea4b3e452288ce2d42d589dcc5319dd49
Signed-off-by: Jan Srnicek <[email protected]>