Wrong feature flags in tests

[YuanYuYuan]

Describe the bug

As titled.

To reproduce

cargo clippy --all-targets -p zenoh -- -D warnings

error: unused import: `zenoh::prelude::r#async::*`
  --> zenoh/tests/liveliness.rs:15:5
   |
15 | use zenoh::prelude::r#async::*;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D unused-imports` implied by `-D warnings`

error: unused import: `std::str::FromStr`
  --> zenoh/tests/matching.rs:14:5
   |
14 | use std::str::FromStr;
   |     ^^^^^^^^^^^^^^^^^
   |
   = note: `-D unused-imports` implied by `-D warnings`

error: unused import: `zenoh_core::ztimeout`
  --> zenoh/tests/liveliness.rs:16:5
   |
16 | use zenoh_core::ztimeout;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `zenoh::prelude::r#async::*`
  --> zenoh/tests/matching.rs:16:5
   |
16 | use zenoh::prelude::r#async::*;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

error: unused import: `zenoh_core::ztimeout`
  --> zenoh/tests/matching.rs:17:5
   |
17 | use zenoh_core::ztimeout;
   |     ^^^^^^^^^^^^^^^^^^^^

error: unused import: `zenoh_result::ZResult as Result`
  --> zenoh/tests/matching.rs:18:5
   |
18 | use zenoh_result::ZResult as Result;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: constant `TIMEOUT` is never used
  --> zenoh/tests/liveliness.rs:18:7
   |
18 | const TIMEOUT: Duration = Duration::from_secs(60);
   |       ^^^^^^^
   |
   = note: `-D dead-code` implied by `-D warnings`

error: constant `SLEEP` is never used
  --> zenoh/tests/liveliness.rs:19:7
   |
19 | const SLEEP: Duration = Duration::from_secs(1);
   |       ^^^^^

error: constant `TIMEOUT` is never used
  --> zenoh/tests/matching.rs:20:7
   |
20 | const TIMEOUT: Duration = Duration::from_secs(60);
   |       ^^^^^^^
   |
   = note: `-D dead-code` implied by `-D warnings`

error: constant `RECV_TIMEOUT` is never used
  --> zenoh/tests/matching.rs:21:7
   |
21 | const RECV_TIMEOUT: Duration = Duration::from_secs(1);
   |       ^^^^^^^^^^^^

error: could not compile `zenoh` (test "liveliness") due to 4 previous errors
warning: build failed, waiting for other jobs to finish...
error: could not compile `zenoh` (test "matching") due to 6 previous errors
error[E0425]: cannot find function `init` in crate `zenoh`
   --> zenoh/tests/session.rs:230:25
    |
230 |     let peer01 = zenoh::init(r1.clone()).res_async().await.unwrap();
    |                         ^^^^ not found in `zenoh`
    |
note: found an item that was configured out
   --> /home/circle/Workings/ZettaScale/src/zenoh/zenoh/src/lib.rs:330:8
    |
330 | pub fn init(runtime: Runtime) -> InitBuilder {
    |        ^^^^
    = note: the item is gated behind the `unstable` feature

error[E0425]: cannot find function `init` in crate `zenoh`
   --> zenoh/tests/session.rs:232:25
    |
232 |     let peer02 = zenoh::init(r2.clone()).res_async().await.unwrap();
    |                         ^^^^ not found in `zenoh`
    |
note: found an item that was configured out
   --> /home/circle/Workings/ZettaScale/src/zenoh/zenoh/src/lib.rs:330:8
    |
330 | pub fn init(runtime: Runtime) -> InitBuilder {
    |        ^^^^
    = note: the item is gated behind the `unstable` feature

error[E0425]: cannot find function `init` in crate `zenoh`
   --> zenoh/tests/session.rs:234:26
    |
234 |     let peer01a = zenoh::init(r1.clone()).res_async().await.unwrap();
    |                          ^^^^ not found in `zenoh`
    |
note: found an item that was configured out
   --> /home/circle/Workings/ZettaScale/src/zenoh/zenoh/src/lib.rs:330:8
    |
330 | pub fn init(runtime: Runtime) -> InitBuilder {
    |        ^^^^
    = note: the item is gated behind the `unstable` feature

For more information about this error, try `rustc --explain E0425`.
error: could not compile `zenoh` (test "session") due to 3 previous errors

System info

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