service: don't use the grandpa observer (#494)
* service: don't use the grandpa observer
* service: remove unnecessary boxing
* service: fix indentation
* service: remove unnecessary on_exit
tasks spawned with `spawn_task`/`spawn_essential_task` are already
guarded by `on_exit`.
* Update service/src/lib.rs
Co-Authored-By: Gavin Wood <[email protected]>
parent
1f576dd4
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