Merge branch 'release/0.6.2' into develop
Update require_otp_vsn
Close socket explicitly when tcp_error occured AND add error logs at right places
Increase the default keepalive value
Increase the default keepalive value#2
Restart a gen_server proc when some error occured
Fix to close a tcp socket properly in any cases
Remove whitespace and format
Upgrade leo_commons to 1.0.0
Upgrade rebar to 2.2.0
Bump leo_rpc to 0.8.0
Merge branch 'release/0.8.0'