* Small timout for worker notification
It seems at the moment if a worker re-establishes notify stream (for example, if network flips or proxy breaks the connection) then we can see "no worker registered with this name" errors.
This change makes Notifier to wait for 30 seconds before failing, at the time of calling `Notifier#Notify` we know such worker exists.
PS not sure if we need to make the timeout configurable.
* Wait via context
* Make sure all `context`s for `Notify` is time bounded
* Lint issues
Matt
Fedor Korotkov
Nikolay Edigaryev