Add setup.py for install with pip

Make possible installation with pip.
Change-Id: I8eec015142c4f29eadff0dac2781782b76dea308

tox.ini

@@ -8,7 +8,9 @@ ignore_basepython_conflict = True
 skip_install = True
 install_command = python -m pip install {opts} {packages}
 basepython = python3
-passenv = OS_*
+passenv =
+    OS_*
+    pip: PIP_INSTALL
 setenv =
     VIRTUAL_ENV={envdir}
     LANG=en_US.UTF-8
@@ -17,8 +19,10 @@ setenv =
     OS_LOG_CAPTURE={env:OS_LOG_CAPTURE:true}
     OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:true}
     OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:true}
+    pip: PIP_INSTALL={env:PIP_INSTALL:true}
 deps =
     -r{toxinidir}/test-requirements.txt
+    pip: {toxinidir}
 
 commands = stestr run {posargs}
            stestr slowest
@@ -36,6 +40,7 @@ deps =
     ruamel.yaml
     galaxy-importer
     git+https://github.com/ansible/ansible
+
 commands =
     python {toxinidir}/tools/build.py
     ansible-galaxy collection build --force {toxinidir} --output-path {toxinidir}/build_artifact
@@ -66,8 +71,15 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,ansible_collections
 
 [testenv:ansible]
 # Need to pass some env vars for the Ansible playbooks
-passenv = HOME USER ANSIBLE_VAR_*
+passenv =
+    HOME
+    USER
+    ANSIBLE_*
 deps =
     {[testenv]deps}
 commands =
     /bin/bash {toxinidir}/ci/run-ansible-tests-collection.sh -e {envdir} {posargs}
+
+[testenv:ansible-pip]
+passenv = {[testenv:ansible]passenv}
+commands = {[testenv:ansible]commands}