This update for rdma-core fixes the following issues:

Update to v31.0 (jsc#SLE-15657, jsc#SLE-15731, jsc#SLE-15743, jsc#SLE-15810, jsc#ECO-3504)

- Keep `rxe_cfg` binary available for SUSE Linux Enterprise 15-SP2 (bsc#1176248)
- Make sure `srp_daemon` is loaded at boot if enabled (bsc#1180196)
- Fix support of older providers with newer `rdma-core` internal ABI

This update was imported from the SUSE:SLE-15-SP2:Update update project.