since merge of POLICY-1630, log level get changed to ERROR when robot healthcheck testsuite is launched using python (and not cli).

The consequence is that our automatic gating tests of OOM reviews doesn't show the results anymore..

The root cause is that some "Create Session" calls of robot/resources/policy_interface.robot are setting disable_warnings to 1 which change the logger level to everything (see https://github.com/bulkan/robotframework-requests/blob/master/src/RequestsLibrary/RequestsKeywords.py#L120).

I've tested the 4 tests without and didn't seen any warnings that could ruin the output.

So I'll propose a fix for that