fix issue that when RRCConnectionRelease happened by UL failure DL SCD doesn't send DCCH(RRCConnectionRelease) to UE because ul_out_of_sync is set to 1

reset release_timer from 200ms to 100ms because of flightmode on/off issue, reduce ul failure timer log

add remove ue info to freeList when RRCConnectionReestablish occurs and for ru_thread to remove the info

Merge branch 'issue271_hundreds_of_ues' of https://gitlab.eurecom.fr/oai/openairinterface5g into issue271_hundreds_of_ues