migration: Fix analyze-migration.py 'configuration' parsing

The 'configuration' state subsections are currently not being parsed
and the script fails when analyzing an aarch64 stream:

Traceback (most recent call last):
  File "./scripts/analyze-migration.py", line 625, in <module>
    dump.read(dump_memory = args.memory)
  File "./scripts/analyze-migration.py", line 571, in read
    raise Exception("Unknown section type: %d" % section_type)
Exception: Unknown section type: 5

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231009184326.15777-3-farosas@suse.de>

scripts/analyze-migration.py

@@ -261,12 +261,21 @@ def getDict(self):
 
 
 class ConfigurationSection(object):
-    def __init__(self, file):
+    def __init__(self, file, desc):
         self.file = file
+        self.desc = desc
 
     def read(self):
-        name_len = self.file.read32()
-        name = self.file.readstr(len = name_len)
+        if self.desc:
+            version_id = self.desc['version']
+            section = VMSDSection(self.file, version_id, self.desc,
+                                  'configuration')
+            section.read()
+        else:
+            # backward compatibility for older streams that don't have
+            # the configuration section in the json
+            name_len = self.file.read32()
+            name = self.file.readstr(len = name_len)
 
 class VMSDFieldGeneric(object):
     def __init__(self, desc, file):
@@ -532,7 +541,8 @@ def read(self, desc_only = False, dump_memory = False, write_memory = False):
             if section_type == self.QEMU_VM_EOF:
                 break
             elif section_type == self.QEMU_VM_CONFIGURATION:
-                section = ConfigurationSection(file)
+                config_desc = self.vmsd_desc.get('configuration')
+                section = ConfigurationSection(file, config_desc)
                 section.read()
             elif section_type == self.QEMU_VM_SECTION_START or section_type == self.QEMU_VM_SECTION_FULL:
                 section_id = file.read32()