Add Oracle cloud provider

[dennis-pg]

• Oracle Cloud Infrastructure detection added
• The metadata server method used by satellite does not seem consistent, so have kept that as un-implemented for now.
• OCI uses a similar metadata server address to Azure, and since the Azure metadata check relied on the code to throw an error while hitting the endpoint, it introduced issues in OCI instances. Here, it returned a 404 but did not throw an error. As a result OCI instances were (and still are for current versions of cloud_detect) being detected as Azure instances. So have added code to check response status in the Azure Provider.

[dennis-pg]

Failing test is due to the issue mentioned for python 3.4 for tox which will be removed following the move to Github actions PR. Else seems fine @dgzlopes