Remove pins.
Properly format passenv list.
Drop the outer tox.ini func-target hack.
Drop the incepted tox in src/test-requirements.txt.
Drop pip.sh script.
Fix undeterministic check in test_configure_deferred_restarts
The test checks output of a class property that provides a list
in undetermined order.
Mocking class properties is non-trivial so let's just sort the
result and expected list.
Closes-Bug: #2001893
Change-Id: I25dec5d1853a5aeb686df353d7c661f4a6eb5b69
bbb1584893