Merge pull request multipath-tcp#33 from pabeni/mptcp_mptcp-net-next

mptcp: add regression test for disconnect()

gtests/net/mptcp/regressions/unconnected_shutdown.pkt

@@ -0,0 +1,14 @@
+// This test case covers the regression fixed by ("mptcp: fix locking in mptcp_disconnect()")
+// shutdown a socket with connect pending, so that mptcp_disconnect()
+// is inoked
+--tolerance_usecs=100000
+`../common/defaults.sh`
+
+0.0 socket(..., SOCK_STREAM, IPPROTO_MPTCP) = 3
++0.0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
++0.0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+
++0.0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
++0.0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8,mpcapable v1 flags[flag_h] nokey>
+
++0.0 shutdown(3, SHUT_WR) = 0