tools/migration: Drop IHDR_VERSION constant from libxc and python

Migration v3 is in the process of being introduced, meaning that the code has
to cope with both versions.  Use an explicit 2 for now.

For the verify-stream-v2 and convert-legacy-stream scripts, update text to say
"v2 (or later)".  What matters is the distinction vs legacy streams.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/python/scripts/verify-stream-v2

@@ -108,7 +108,7 @@ def main():
 
     parser = OptionParser(usage = "%prog [options]",
                           description =
-                          "Verify a stream according to the v2 spec")
+                          "Verify a stream according to the v2 (or later) spec")
 
     # Optional options
     parser.add_option("-i", "--in", dest = "fin", metavar = "<FD or FILE>",