Julia/couchbase e2e

[hithwen]

Adds couchbase e2e
Support for device check in e2e tests. Changes to base and dev have been also tested against apache e2e test

[codecov]

Codecov Report

Merging #4328 into master will decrease coverage by 7.1%.
The diff coverage is 84.9%.

Impacted Files	Coverage Δ
datadog_checks_dev/datadog_checks/dev/_env.py	53.22% <ø> (ø)	⬆️
...g_checks_base/datadog_checks/base/stubs/similar.py	87.87% <100%> (+0.57%)	⬆️
couchbase/datadog_checks/couchbase/couchbase.py	69.06% <100%> (-0.67%)	⬇️
datadog_checks_base/tests/test_similar.py	100% <100%> (ø)	⬆️
...dog_checks_base/datadog_checks/base/checks/base.py	74.76% <100%> (+0.15%)	⬆️
...og_checks_base/datadog_checks/base/stubs/common.py	100% <100%> (ø)	⬆️
couchbase/tests/test_couchbase.py	88.46% <68.42%> (-11.54%)	⬇️
...hecks_base/datadog_checks/base/stubs/aggregator.py	67.08% <75%> (-0.85%)	⬇️
datadog_checks_base/tests/test_pdhbasecheck.py	32% <0%> (-68%)	⬇️
datadog_checks_base/tests/test_winpdh.py	32.55% <0%> (-65.12%)	⬇️
... and 675 more

[AlexandreYang]

Looks good, just one comment about the "extract_device" logic.

[AlexandreYang]

This feel a bit hackish to make the test work for both integration and e2e.