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Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-07-18-v2' into staging
QAPI patches for 2017-07-18
# gpg: Signature made Mon 24 Jul 2017 12:40:56 BST
# gpg: using RSA key 0x3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653
* remotes/armbru/tags/pull-qapi-2017-07-18-v2:
migration: Use JSON null instead of "" to reset parameter to default
migration: Unshare MigrationParameters struct for now
migration: Add TODO comments on duplication of QAPI_CLONE()
migration: Clean up around tls_creds, tls_hostname
hmp: Clean up and simplify hmp_migrate_set_parameter()
block: Use JSON null instead of "" to disable backing file
tests/test-qobject-input-visitor: Drop redundant test
qapi: Introduce a first class 'null' type
qapi: Use QNull for a more regular visit_type_null()
qapi: Separate type QNull from QObject
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>