Fix SHM tests · eclipse-zenoh/zenoh@2fa04c6

The process '/home/runner/.cargo/bin/cargo' failed with exit code 100

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Run tests with SHM: io/zenoh-transport/tests/unicast_transport.rs#L225

constant `MSG_SIZE_NOFRAG` is never used

`zenoh-transport` (test "unicast_transport") generated 1 warning

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L32

unused import: `Priority`

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L49

constant `TIMEOUT` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L50

constant `SLEEP` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L51

constant `SLEEP_COUNT` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L53

constant `MSG_COUNT` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L54

constant `MSG_SIZE_NOFRAG` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L76

method `get_count` is never used

Run tests with SHM: io/zenoh-transport/tests/multicast_transport.rs#L141

struct `TransportMulticastPeer` is never constructed

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