incusd/network/ovsdb: Properly close the connections #307

Job	Run time
Documentation	6m 39s
Code	6m 33s
Client (1.20.x, ubuntu-latest)	17s
System (1.20.x, cluster, dir)	11m 40s
Client (1.20.x, macos-latest)	1m 4s
System (1.20.x, cluster, btrfs)	12m 41s
Client (1.20.x, windows-latest)	1m 54s
System (1.20.x, cluster, lvm)	13m 59s
System (1.20.x, cluster, zfs)	12m 59s
System (1.20.x, cluster, ceph)	15m 47s
System (1.20.x, cluster, random)	13m 20s
System (1.20.x, standalone, dir)	22m 12s
System (1.20.x, standalone, btrfs)	21m 42s
System (1.20.x, standalone, lvm)	39m 31s
System (1.20.x, standalone, zfs)	43m 28s
System (1.20.x, standalone, ceph)	1h 14m 10s
System (1.20.x, standalone, random)	22m 45s
System (stable, cluster, dir)	11m 1s
System (stable, standalone, dir)	20m 56s
System (tip, cluster, dir)	11m 42s
System (tip, standalone, dir)	22m 2s
	6h 26m 22s

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