Description of problem:
Do migration with --parallel-connections, kill dest virtproxy(for p2p migration) or src virtqemud(for p2p/non-p2p migration) during migration. Then do migration again without --parallel-connections, migration will fail.

Version-Release number of selected component (if applicable):
libvirt-8.5.0-1.el9.x86_64
qemu-kvm-7.0.0-8.el9.x86_64


How reproducible:
100%

Steps to Reproduce:
1. Start a vm

2. Do migration with --parallel-connections:
   # virsh migrate vm1 qemu+tcp://******/system --live --postcopy --parallel --compressed --comp-methods xbzrle --bandwidth 4 --parallel-connections 4 [--p2p]

3. Kill dest virtproxyd if it is p2p migration, or kill src virtqemud if it is p2p or non-p2p migration

4. Check migration status, it failed. And check migration parameters, the parameters are not restored:
   # virsh qemu-monitor-command vm1 '{"execute":"query-migrate-parameters"}'
{"return":{"cpu-throttle-tailslow":false,"xbzrle-cache-size":67108864,"cpu-throttle-initial":20,"announce-max":550,"decompress-threads":2,"compress-threads":8,"compress-level":1,"multifd-channels":4,"multifd-zstd-level":1,"announce-initial":50,"block-incremental":false,"compress-wait-thread":true,"downtime-limit":300,"tls-authz":"","multifd-compression":"none","announce-rounds":5,"announce-step":100,"tls-creds":"","multifd-zlib-level":1,"max-cpu-throttle":99,"max-postcopy-bandwidth":0,"tls-hostname":"","throttle-trigger-threshold":50,"max-bandwidth":4194304,"x-checkpoint-delay":20000,"cpu-throttle-increment":10},"id":"libvirt-14"}



5. Do migration again without --parallel-connections, it failed:
   #  virsh migrate vm1 qemu+tcp://******/system --live --postcopy --parallel --compressed --comp-methods xbzrle --bandwidth 4 [--p2p]


Actual results:
As step5, migration failed.

Expected results:
Step5 can succeed

Additional info:
Dest qemu log:
2022-07-17T08:02:17.058157Z qemu-kvm: socket_accept_incoming_migration: Extra incoming migration connection; ignoring
2022-07-17T08:02:17.058189Z qemu-kvm: socket_accept_incoming_migration: Extra incoming migration connection; ignoring

Src qemu log:
2022-07-17 08:02:17.068+0000: initiating migration
2022-07-17T08:02:17.081109Z qemu-kvm: Unable to write to socket: Connection reset by peer
2022-07-17T08:02:17.118964Z qemu-kvm: Unable to read from socket: Bad file descriptor
2022-07-17T08:02:17.118977Z qemu-kvm: Unable to read from socket: Bad file descriptor
2022-07-17T08:02:17.118982Z qemu-kvm: Unable to read from socket: Bad file descriptor