On BBSIM, OMCI connection is broken after DHCP installed

When running BBSIM, after "volt-add-subscriber-access", it always can be seen that ONU status reach "omci-flows-failed-retrying" .

Analysis:

From log,  It is obvious that after DHCP installed in BBSIM, ONU's state moves to ONU_ANTHENTICAED which is not allow omci packet.

Fix for this bug: In function OmciMsgOut, add ONU_ANTHENTICAED to accept OMCI messages.

Logs:

{{time="2019-09-19T14:28:22Z" level=debug msg="OLT 0 receives OmciMsgOut to IF 0 (ONU-ID: 1) pkt:30323036343630613030353432313033303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303030303238." topics="[bbsim.log]"
time="2019-09-19T14:28:22Z" level=debug msg="ONU-ID: 1, ONU state: 3" topics="[bbsim.log]"
time="2019-09-19T14:28:22Z" level=info msg="ONU (IF 0 ONU-ID: 1) is not ACTIVE, so not processing OmciMsg"}}

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