Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'dublin'
  to 864ce56c3daff6a6a1f4b9ae1ebcb24c2aa87f2a
  - Merge "Add SO Update the repeatable Macro - northbound_request_ref_lookup" into dublin
  - Add SO Update the repeatable Macro - northbound_request_ref_lookup

    Added dublin - Update repeatable Macro not to lose the ability to
    drive flows differently based on service type.
    UPDATE northbound_request_ref_lookup SET SERVICE_TYPE = '*' WHERE SERVICE_TYPE = NULL;
    Issue-ID: SO-1892
    Signed-off-by: Bonkur, Venkat (vb8416) <vb8416@att.com>
    Change-Id: I3fa58559fe4596b3a0e184a8391ac93fb9496a26