Remove python 2.7 from tox configuration

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = bandit, flake8, black, py27, py3
+envlist = bandit, flake8, black, py3
 
 [testenv:flake8]
 deps =
@@ -26,21 +26,6 @@ commands =
     {[testenv:flake8]commands}
     black --check --diff pungi pungi_utils setup.py tests --exclude tests/_composes
 
-[testenv:py27]
-sitepackages = true
-deps =
-    -rrequirements.txt
-    -rtest-requirements.txt
-allowlist_externals =
-    sh
-    make
-    coverage
-commands =
-    sh -c 'find . -name "*.pyc" -exec rm -f \{\} +'
-    pip install --force-reinstall pytest mock
-    make test-coverage
-    coverage xml
-
 [testenv:py3]
 sitepackages = true
 deps =