Add postcopy migration qtests with new QAPI syntax, having 'channels' as
the starting argument.
Also, introduce 'channels' to migrate_incoming_qmp function so as to
call migration with the new QAPI syntax from src as well as dest.

Patch 1:
--------
Revert back commit which temporarily introduced 'migrate-incoming' QAPI
with the new 'channels' syntax.

Patch 2-3:
---------
Introduce channels arg to migrate_incoming_qmp

Patch 4:
-------
Introduce postcopy qtests with new QAPI syntax

Het Gala (4):
  Revert "migration: modify test_multifd_tcp_none() to use new QAPI
    syntax"
  tests/qtest/migration: Replace 'migrate-incoming'
    qtest_qmp_assert_success with migrate_incoming_qmp
  tests/qtest/migration: Add channels parameter in migrate_incoming_qmp
  tests/qtest/migration: Add postcopy migration qtests to use 'channels'
    argument instead of uri

 tests/qtest/migration-helpers.c   | 13 ++++++--
 tests/qtest/migration-helpers.h   |  4 +--
 tests/qtest/migration-test.c      | 54 +++++++++++++++++++++++--------
 tests/qtest/virtio-net-failover.c |  8 ++---
 4 files changed, 58 insertions(+), 21 deletions(-)

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2.22.3