qapi: Use 'struct' instead of 'type' in schema

Referring to "type" as both a meta-type (built-in, enum, union,
alternate, or struct) and a specific type (the name that the
schema uses for declaring structs) is confusing.  Do the bulk of
the conversion to "struct" in qapi schema, with a fairly
mechanical:

for f in `find -name '*.json'; do sed -i "s/'type'/'struct'/"; done

followed by manually filtering out the places where we have a
'type' embedded in 'data'.  Then tweak a couple of tests whose
output changes slightly due to longer lines.

I also verified that the generated files for QMP and QGA (such
as qmp-commands.h) are the same before and after, as assurance
that I didn't leave in any accidental member name changes.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
diff --git a/qapi/common.json b/qapi/common.json
index 63ef3b4..12431c6 100644
--- a/qapi/common.json
+++ b/qapi/common.json
@@ -50,7 +50,7 @@
 #
 # Since: 0.14.0
 ##
-{ 'type': 'VersionInfo',
+{ 'struct': 'VersionInfo',
   'data': {'qemu': {'major': 'int', 'minor': 'int', 'micro': 'int'},
            'package': 'str'} }
 
@@ -74,7 +74,7 @@
 #
 # Since: 0.14.0
 ##
-{ 'type': 'CommandInfo', 'data': {'name': 'str'} }
+{ 'struct': 'CommandInfo', 'data': {'name': 'str'} }
 
 ##
 # @query-commands: