tox depends succeeds when common SDK dependencies are missing

[chlowell]

The depends test installs a package and imports all its modules to identify missing dependencies. However, it begins by installing a number of common SDK dependencies. It therefore won't fail when the package under test doesn't declare a dependency on one or more of these. For example, azure-keyvault-secrets was missing a dependency on azure-common which wasn't discovered until manual verification of a release build.

This happens because depends depends on deps:

azure-sdk-for-python/eng/tox/tox.ini

Lines 144 to 145 in cd568ca

	deps =
	{[tools]deps}

which installs azure-sdk-tools:

azure-sdk-for-python/eng/tox/tox.ini

Lines 6 to 8 in cd568ca

	[tools]
	deps =
	-r ../../../eng/test_tools.txt

azure-sdk-for-python/eng/test_tools.txt

Line 30 in cd568ca

../../../tools/azure-sdk-tools

which installs a few management packages:

azure-sdk-for-python/tools/azure-sdk-tools/setup.py

Lines 22 to 24 in cd568ca

	'azure-mgmt-resource',
	'azure-mgmt-storage',
	'azure-mgmt-keyvault'

and all their transitive dependencies.

[kurtzeborn]

Labeling this "Client" since I believe this is work that should be owned by the langauge experts on the client team. Remember that the yellow labels are for tracking who owns the work (not the area). If you need any engsys related guidance or help, please reach out to @scbedd.