python: Backport argparse to older platforms.

Argparse has some convenient advantages over optparse including the
ability to handle optional arguments to flags.  It also supports
parsing arguments as well as options.

This patch copies argparse.py from Python 2.7 into a newly created
compat directory.  It made some very minor syntactic updates in the
process.  Platforms which have a Python version too old to include
argparse by default will have this compat version installed as a
workaround.

1 files changed, 52 insertions, 0 deletions

diff --git a/COPYING b/COPYING
index 8d1bc9d5..ad17c7c6 100644
--- a/COPYING
+++ b/COPYING
@@ -25,3 +25,55 @@ basis.  Refer to each file for details.
 Files lib/sflow*.[ch] are licensed under the terms of the InMon sFlow
 licence that is available at:
         http://www.inmon.com/technology/sflowlicense.txt
+
+Files under python/compat are licensed under the Python Software
+Foundation License, version 2:
+
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+   --------------------------------------------
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