BGPSpeaker/net_ctrl: Close activity for each session
BGPSpeaker/net_ctrl: Close activity for each session

Currently, a thread for processing outgoing message will be remained in
"RpcSession" activity even if RPC session is closed by the remote peer,
and garbages on memory will grow.

This patch fixes to close "RpcSession" activity when RPC session
closing.

Signed-off-by: IWASE Yusuke <bb80e84cc9f5a8f01385872ee89032beb5d4eba7@gmail.com>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

iwaseyusuke/ryu,fujita/ryu,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext,fujita/ryu,fujita/ryu,osrg/ryu,iwaseyusuke/ryu,fujita/ryu,lagopus/ryu-lagopus-ext,osrg/ryu,fujita/ryu,osrg/ryu,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext,osrg/ryu,lagopus/ryu-lagopus-ext,osrg/ryu,iwaseyusuke/ryu,lagopus/ryu-lagopus-ext