README update and sdwan.py edit#4

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eggee wants to merge 5 commits intoCiscoDevNet:masterfrom

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Commits on Jun 16, 2019

Remove the extra unecessary '/' from the login_action
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Update README to use/reference python3.7 instead of 3.6
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Update README environment variables to point to the REST API and use working username/password values
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Add print statements to show what was returned from the login attempt.
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Commits on Jun 18, 2019

working config.
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