qobject: Add helper macros for common scalar insertions

qobject: Add helper macros for common scalar insertions

Rather than making lots of callers wrap a scalar in a QInt, QString,
or QBool, provide helper macros that do the wrapping automatically.

Update the Coccinelle script to make mass conversions easy, although
the conversion itself will be done as a separate patches to ease
review and backport efforts.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170427215821.19397-6-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
(cherry picked from commit a92c21591b5bb9543996538f14854ca6b528318b)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>