logging, service_url and auth_type case insensitive changes

[ehdsouza]

This PR contains the following:

1. Show logging in readme
2. Change url to service_url
3. Validate that service_url is set in the prepare_request
4. Make "auth type" case-insensitive

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #26 into next will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             next      #26      +/-   ##
==========================================
+ Coverage   98.18%   98.18%   +<.01%     
==========================================
  Files          16       16              
  Lines         495      497       +2     
==========================================
+ Hits          486      488       +2     
  Misses          9        9

Impacted Files	Coverage Δ
ibm_cloud_sdk_core/base_service.py	97.54% <100%> (+0.04%)	⬆️
ibm_cloud_sdk_core/utils.py	98.01% <100%> (ø)	⬆️

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[padamstx]

Looks good, but I think you should add a test that uses mixed case authentication types just to be complete. I'll approve the PR now and you can add the tests separately.

[ehdsouza]

@padamstx there is already a test case covering it: https://github.com/IBM/python-sdk-core/blob/next/resources/ibm-credentials-no-auth.env

[watson-github-bot]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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