Add support to python3

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Fist make the python 2.X version as compatible as possible with python 3 (e.g. 
by modifying ZSI's object types comparisons with the isinstance built-in)

Then run 2to3 and add the necessary fixes

Original issue reported on code.google.com by argo...@gmail.com on 21 Mar 2012 at 5:35

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in r64: Some enhancements as a start to make the code python 3 compatible

Removed unused imports (in ZSI)
Removed dead code from ZSI

First changes to make pysphere python3 compatible:
 * replaced ZSI types verifications from type() to isinstance()
 * replaced dictionary calls to has_key() for "key in d"

Original comment by argo...@gmail.com on 26 Mar 2012 at 6:54

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Any update on when a python 3 version would be available?

Original comment by mjst...@gmail.com on 7 Jun 2012 at 9:00

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Any information on the Python 3 support? Or maybe there has been some 
development done on "THE" python vsphere library...

Original comment by ad...@vbridges.com on 15 Aug 2013 at 7:19

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I think we should support python 2.7.9 and python 3.4.2.. that is better

Original comment by zhaobin...@gmail.com on 25 Dec 2014 at 3:02

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Is a python 3.4 compatible version of pysphere available ? Any update on this 
would be of great help. We are working with Python 3.4 and cannot go back to 
Python 2.7. 

Original comment by vijaysum...@gmail.com on 14 Apr 2015 at 6:39