analyze-migration.py: fix extract contents ('-x') errors

When we try to use 'analyze-migration.py -x' with python3,
we have the following errors:

  Traceback (most recent call last):
    File "scripts/analyze-migration.py", line 593, in <module>
      f.write(jsonenc.encode(dump.vmsd_desc))
  TypeError: a bytes-like object is required, not 'str'

  Traceback (most recent call last):
    File "scripts/analyze-migration.py", line 601, in <module>
      f.write(jsonenc.encode(dict))
  TypeError: a bytes-like object is required, not 'str'

This happens because the file 'f' is open in binary mode while
jsonenc.encode() returns a string.

The results are human-readable files, 'desc.json' and 'state.json',
so there is no reason to use the binary mode.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211015131645.501281-3-lvivier@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

scripts/analyze-migration.py

@@ -588,7 +588,7 @@ def default(self, o):
 
     dump.read(desc_only = True)
     print("desc.json")
-    f = open("desc.json", "wb")
+    f = open("desc.json", "w")
     f.truncate()
     f.write(jsonenc.encode(dump.vmsd_desc))
     f.close()
@@ -596,7 +596,7 @@ def default(self, o):
     dump.read(write_memory = True)
     dict = dump.getDict()
     print("state.json")
-    f = open("state.json", "wb")
+    f = open("state.json", "w")
     f.truncate()
     f.write(jsonenc.encode(dict))
     f.close()