Pin setuptools in test_allow_unsafe_option

[webknjaz]

FTR, would be nice to pin setuptools here as well, but it would take to rewrite the test.

Originally posted by @atugushev in #975

[atugushev]

Better to be fixed after #990.

[atugushev]

@hramezani would you be interested in this issue as a followup #990?

Since test_allow_unsafe_option has been already refactored we can pin now the package (small-fake-a) in parameters and make test_allow_unsafe_option test more assertive:

...
[("--allow-unsafe", "\nsmall-fake-a==0.1"), (None, "\n# small-fake-a")],
...
assert expected in out.stderr.splitlines()

Also, would be nice to fix test_local_url_package the same way.

[hramezani]

@atugushev yes, Just assign it to me.

[atugushev]

@hramezani, thanks!