Merge branch 'VSOCK-add-vsock_test-test-suite'

Merge branch 'VSOCK-add-vsock_test-test-suite'

Stefano Garzarella says:

====================
VSOCK: add vsock_test test suite

The vsock_diag.ko module already has a test suite but the core AF_VSOCK
functionality has no tests. This patch series adds several test cases that
exercise AF_VSOCK SOCK_STREAM socket semantics (send/recv, connect/accept,
half-closed connections, simultaneous connections).

The v1 of this series was originally sent by Stefan.

v3:
- Patch 6:
  * check the byte received in the recv_byte()
  * use send(2)/recv(2) instead of write(2)/read(2) to test also flags
    (e.g. MSG_PEEK)
- Patch 8:
  * removed unnecessary control_expectln("CLOSED") [Stefan].
- removed patches 9,10,11 added in the v2
- new Patch 9 add parameters to list and skip tests (e.g. useful for vmci
  that doesn't support half-closed socket in the host)
- new Patch 10 prints a list of options in the help
- new Patch 11 tests MSG_PEEK flags of recv(2)

v2: https://patchwork.ozlabs.org/cover/1140538/
v1: https://patchwork.ozlabs.org/cover/847998/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>