Merge remote branches 'public/fiber-raise',...

Merge remote branches 'public/fiber-raise', 'public/core-pull_from_remote_exit' and 'public/core-remote_state_to_header'

* public/fiber-raise:
  [core] Add ability to raise an exception in the other fiber.

* public/core-pull_from_remote_exit:
  [core] exit from 'remote hot standby' fiber in case of EXIT_FIBER exception

* public/core-remote_state_to_header:
  [core] move remote_state to log_io header