TcpTransportSocket: fix deadlock
TcpTransportSocket: fix deadlock

Don't hold mutex when trigerring disconnect signal

Change-Id: I9586c0a2174d7f3863dc470b2310f7ba38364049
Reviewed-on: http://gerrit.aldebaran.lan/66041
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Reviewed-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi