qapi: make the json schema files more regular.

This makes it easier to parse the schema file for tool generation:
each paragraph is either a non-docstring comment, or a docstring
immediately followed by a Python dict describing an API item.

Signed-off-by: David Anderson <dave@natulte.net>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qapi-schema.json

@@ -752,6 +752,7 @@
             'cpu-throttle-increment': 'int',
             'tls-creds': 'str',
             'tls-hostname': 'str'} }
+
 ##
 # @query-migrate-parameters
 #
@@ -4118,7 +4119,6 @@
 #
 # Since 1.6
 ##
-
 { 'struct': 'RxFilterInfo',
   'data': {
     'name':               'str',
@@ -4338,7 +4338,6 @@
 #
 # Since: 2.1
 ##
-
 { 'struct': 'Memdev',
   'data': {
     'size':       'size',

qapi/block-core.json

@@ -25,7 +25,6 @@
 # Since: 1.3
 #
 ##
-
 { 'struct': 'SnapshotInfo',
   'data': { 'id': 'str', 'name': 'str', 'vm-state-size': 'int',
             'date-sec': 'int', 'date-nsec': 'int',
@@ -81,7 +80,6 @@
 #
 # Since: 1.7
 ##
-
 { 'union': 'ImageInfoSpecific',
   'data': {
       'qcow2': 'ImageInfoSpecificQCow2',
@@ -129,7 +127,6 @@
 # Since: 1.3
 #
 ##
-
 { 'struct': 'ImageInfo',
   'data': {'filename': 'str', 'format': 'str', '*dirty-flag': 'bool',
            '*actual-size': 'int', 'virtual-size': 'int',
@@ -181,7 +178,6 @@
 # Since: 1.4
 #
 ##
-
 { 'struct': 'ImageCheck',
   'data': {'filename': 'str', 'format': 'str', 'check-errors': 'int',
            '*image-end-offset': 'int', '*corruptions': 'int', '*leaks': 'int',
@@ -518,7 +514,6 @@
 #
 # Since: 2.5
 ##
-
 { 'struct': 'BlockDeviceTimedStats',
   'data': { 'interval_length': 'int', 'min_rd_latency_ns': 'int',
             'max_rd_latency_ns': 'int', 'avg_rd_latency_ns': 'int',