Runtime: Always wake runner immediately once a new task is enqueued

[nightkr]

Fixes #372

[nightkr]

@joell Can you confirm that this fixes your issue? It won't repro for me anymore, at least..

@clux I know we don't really do LTS, but maybe it's worth backporting this to 0.45.1 or something, since it's pretty critical for controllers, and 0.45 will presumably be the final release to support Tokio 0.2 (which people might be stuck on for Legacy Reasons).

[clux]

@teozkr : Sure, if this fixes it I can cherry-pick this to a tokio02 branch from before the 1.0 merges and publish a patch-release.

[clux]

Planning on getting this in a minor today.

[joell]

@teozkr: Yes, I can confirm that this change fixes #372 in my testing.

Thank you for resolving this so quickly! I hope it didn't take too much time away from your holiday.

[clux]

Released in kube* 0.47.0

[clux]

@teozkr : i tried cherry picking this commit from the last 0.46.0 commit into a new branch, but it's already using tokio 1.0 features.

The import reordering of tokio imports + rename of sleep -> delay_for was fine, but tests requires #[tokio::test(flavor = "current_thread")] which isn't there, and based on the comments it sounds necessary. Are you able to help make a fixup branch? I can publish it as 0.46.1 everywhere.

[nightkr]

@clux The 0.2 equivalent should be core_threads = 1: https://docs.rs/tokio/0.2.24/tokio/attr.test.html

[clux]

0.46.1 now released everywhere from the tokio02 branch.