Update __init__ method params

[ChristineTChen]

What does this PR do?

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Motivation

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Additional Notes

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Review checklist (to be filled by reviewers)

• 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
• Feature or bugfix must have tests
• Git history must be clean
• If PR adds a configuration option, it must be added to the configuration file.

[codecov]

Codecov Report

Merging #4243 into master will decrease coverage by 3.16%.
The diff coverage is 86.66%.

Impacted Files	Coverage Δ
harbor/datadog_checks/harbor/harbor.py	85.86% <100%> (ø)	⬆️
teamcity/datadog_checks/teamcity/teamcity.py	64.7% <100%> (ø)	⬆️
teamcity/tests/test_teamcity.py	97.43% <100%> (ø)	⬆️
fluentd/datadog_checks/fluentd/fluentd.py	91.11% <100%> (-0.38%)	⬇️
go_expvar/tests/conftest.py	100% <100%> (ø)	⬆️
fluentd/tests/conftest.py	100% <100%> (ø)	⬆️
go_expvar/datadog_checks/go_expvar/go_expvar.py	82.3% <100%> (ø)	⬆️
lighttpd/datadog_checks/lighttpd/lighttpd.py	79.26% <50%> (ø)	⬆️
riakcs/datadog_checks/riakcs/riakcs.py
oracle/tests/test_oracle.py
... and 704 more