Run tests via tox

This could simplify jenkins job configuration and make the tasks
trackable in git.

JIRA: RHELCMP-1618
Signed-off-by: Haibo Lin <hlin@redhat.com>

tox.ini

@@ -1,21 +1,81 @@
 [tox]
-envlist = py27, py36
+envlist = flake8, black, py27, py3
 
-[testenv]
+[testenv:flake8]
 deps =
     flake8
 whitelist_externals = sh
 commands =
     sh -c "flake8 pungi pungi_utils setup.py tests/*py"
 
-[testenv:py36]
+[testenv:black]
+basepython = python3
+whitelist_externals = sh
 deps =
-    {[testenv]deps}
+    {[testenv:flake8]deps}
     black
 commands =
-    {[testenv]commands}
+    {[testenv:flake8]commands}
     black --check --diff pungi pungi_utils setup.py tests --exclude tests/_composes
 
+[testenv:py27]
+sitepackages = true
+deps =
+    funcsigs
+    productmd
+    jsonschema
+    fedmsg
+    ordered_set
+    python-multilib
+    modulemd
+    kobo
+    koji
+    pykickstart
+    lxml
+    dogpile.cache
+    mmdzanata
+    parameterized
+    dict.sorted
+    mock
+    nose
+    nose-cov
+whitelist_externals =
+    sh
+    make
+    coverage
+commands =
+    sh -c 'find . -name "*.pyc" -exec rm -f \{\} +'
+    make test-coverage
+    coverage xml
+
+[testenv:py3]
+sitepackages = true
+deps =
+    funcsigs
+    productmd
+    jsonschema
+    fedmsg
+    ordered_set
+    python-multilib
+    unittest2
+    modulemd
+    kobo
+    koji
+    pykickstart
+    lxml
+    dogpile.cache
+    mmdzanata
+    parameterized
+    dict.sorted
+    mock
+    nose
+whitelist_externals =
+    sh
+    make
+commands =
+    sh -c 'find . -name "__pycache__" -exec rm -rf \{\} +'
+    make test
+
 [flake8]
 exclude = doc/*,*.pyc,*.py~,*.in,*.spec,*.sh,*.rst
 filename = *.py
@@ -30,4 +90,6 @@ max-line-length = 88
 ignore = E402,H301,H306,E226,W503,E203
 
 [run]
-omit = tests/*
+omit =
+    tests/*
+    .tox/*