Add skip reason next to test name in zuul output

Currently our test names are long and we pipe pytest output to a file,
so the skip reason gets truncated; setting this env var .zuul and
passing to tox.ini will allow us to see the reason why pytest is
skipping next to the test name.

Drive-by: remove passenv from s3api tests in tox.ini so they are
inherited from testenv

Related-Change-Id: I6b7cc64262d2f8ef7e3bbce30bab5550899b5211
Change-Id: I15791a9238485190acf7f87a3b562bf67e7c5c09

tox.ini

@@ -24,13 +24,13 @@ allowlist_externals =
   bash
   find
 passenv = SWIFT_*
+          COLUMNS
 
 [testenv:s3api]
 usedevelop = False
 deps = {[testenv:py36]deps}
 commands =
   pytest {posargs:test/s3api}
-passenv = SWIFT_*
 # For some reason we hit some EPERM issue when building the package for these tests?
 # (CentOS 8, CPython 3.6, tox 3.28.0)
 skipsdist = True