Correctly use SSL options for health checks

[juliogreff]

What does this PR do?

Fixes a warning printed out when running the kube_scheduler and kube_controller_manager checks:

2021-08-24 08:34:49 UTC | CORE | WARN | (pkg/collector/python/datadog_agent.go:124 in LogMessage) | kube_scheduler:f99c6bf7f3d8b29b | (http.py:338) | An unverified HTTPS request is being made to https://172.18.0.4:10259/healthz
2021-08-24 08:34:57 UTC | CORE | WARN | (pkg/collector/python/datadog_agent.go:124 in LogMessage) | kube_controller_manager:ec28c854e9635dd6 | (http.py:338) | An unverified HTTPS request is being made to https://172.18.0.4:10257/healthz

It does so by setting defaults for tls_ignore_warning and tls_verify according to the other tls_* settings. If those aren't present, it sets empty defaults for those as well.

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #9977 (f759346) into master (669f56c) will increase coverage by 0.00%.
The diff coverage is 94.11%.

Flag	Coverage Δ
kube_controller_manager	96.85% <94.11%> (-0.29%)	⬇️
kube_scheduler	96.20% <94.11%> (-0.21%)	⬇️

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[ofek]

Can HTTP_CONFIG_REMAPPER not be used? https://datadoghq.dev/integrations-core/base/http/