F1: Received unsuccessful result for SCTP association

Description: When running F1 split with CU running in one host and DU in another host, CU prints these logs after the DU connection:

[RRC]   Accepting DU 3584 (gNB-OAI), sending F1 Setup Response
[SCTP]   SCTP_ASSOC_CHANGE to SCTP_COMM_LOST
[SCTP]   sctp_recvmsg (fd 106, len -1 ): Connection reset by peer:104
[F1AP]   Received unsuccessful result for SCTP association (3), instance 0, cnx_id 0

When a UE tries to connect, the CU gets an Assertion at RRCSetupRequest (more details can be provided)

How to fix: Reverting this commit:

!2476 (28411652)

This can also be reproduced between 2 Virtual Machines. When CU and DU run in the same host the issue does not happen.