MFC r272936: Update isp_tgt_map and send new arrival notification if target that departed earlier has returned.  Previously that code worked only once, confusing CTL.
MFC r272936:
Update isp_tgt_map and send new arrival notification if target that departed
earlier has returned.  Previously that code worked only once, confusing CTL.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase