session: Support stopping of SessionActor
session: Support stopping of SessionActor

While at it, drop unnecessary imports.

Signed-off-by: Karim Osman <94396faf6cc817be76165477038b3cfa832e89a4@reaktor.fi>
Acked-by: Harri Salokorpi <eefb23b8deb8c30dca252cd0ae751b67337dc69f@reaktor.fi>

akisaarinen/ccf,akisaarinen/ccf