Update SimpleHttpOperator to take auth type object

[fredthomsen]

A requests.auth.AuthBase object is not passed through from the
SimpleHttpOperator to the underlying HttpHook, thus if you want to
use the SimpleHttpOperator but have a custom auth_type, you must
inherit from it and override the execute method. Update the operator
to take this parameter.

Seems like a small oversight that existing tests should cover.

[boring-cyborg]

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[fredthomsen]

This does address issue #259, although given it's age, I doubt that is relevant now, which is why I did not include it above.

[github-actions]

The PR is likely OK to be merged with just subset of tests for default Python and Database versions without running the full matrix of tests, because it does not modify the core of Airflow. If the committers decide that the full tests matrix is needed, they will add the label 'full tests needed'. Then you should rebase to the latest master or amend the last commit of the PR, and push it with --force-with-lease.

[ashb]

@fredthomsen Could you rebase please?

[fredthomsen]

@fredthomsen Could you rebase please?

@ashb done.