We need to avoid blocking the coordinator for too long.

Allows to override the log level through the `RUST_LOG` env variable.

Forwarded by coordinator

Run dynamic node

Allows us to mark certain node errors as cascading, which will deprioritize them when printed.

Also updates the error printing code to only print the error that happened first.

* refuse pass relative path to remote daemon

* add local ip checker in dora start

* delete some additional packages on CI to make enough space available

* add coodinator_is_remote argument

We plan to (soft-)remove operators and simplify the dataflow YAML file by removing the additional nesting caused by the `custom` field. This commit prepares for that. See #474 for context.

I added a test to confirm the output matches the old.

Fixes clippy warning clippy::format_collect
https://rust-lang.github.io/rust-clippy/master/index.html#/format_collect

We are not interested in the local bind address of the daemon. Instead, we want to use the IP address under which the daemon is available from other machines.

This should also avoids the issue that connecting to 0.0.0.0 is not possible on Windows (we want to use 0.0.0.0 as default bind address).

This reverts commit 1ba763cd67.

Ref: #459

Tokio background tasks are canceled when the program exits, so we need some additional synchronization to ensure that the `DestroyResult` is actually sent out.

Make dataflow descriptor available to Python nodes and operators

The dataflow might be finished already when `dora stop` is invoked, which caused an error previously. This commit changes this behavior to return the dataflow result instead in this case.

The name generator uses a thread-local random number generator internally, which makes it `!Send`. So we should not keep it across await points because our `multiple_daemons` example needs to spawn it in the tokio runtime, which requires `Send`.