[VCDA-2669] Add VCDApiVersion object for easy version comparison

[Anirudh9794]

Signed-off-by: Aniruddha Shamasundar aniruddha.9794@gmail.com

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Create a version class for easy comparison of version objects

Testing done:

• Checked if comparisons are as expected.
• Added 37-alpha version to supported api version list
• Checked if login works properly after the changes

@rocknes @sakthisunda

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This change is 

[Anirudh9794]

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pyvcloud/vcd/client.py, line 31 at r1 (raw file):

Previously, rocknes wrote…

I think he forgot to add the file to the PR :P Great catch Sakthi :)

sorry about that, Added the missing module