[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Increase requests lower requirement since oslo.config needs 2.18.0.
Fix idna lower-constraint to satisfy requests.

Change-Id: I753e09613b50e099060e2c85eb80d06d8b257858

.zuul.yaml

@@ -2,21 +2,20 @@
     templates:
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti
       - check-requirements
     check:
       jobs:
-        - heat-translator-tox-py27-tp:
+        - heat-translator-tox-py37-tp:
             voting: false
 
 - job:
-    name: heat-translator-tox-py27-tp
+    name: heat-translator-tox-py37-tp
-    parent: openstack-tox
+    parent: openstack-tox-py37
     description: |
       Run tests for heat-translator project.
 
-      Uses tox with the ``py27-tp`` environment.
+      Uses tox with the ``py37-tp`` environment.
     vars:
-      tox_envlist: py27-tp
+      tox_envlist: py37-tp

doc/requirements.txt

@@ -2,5 +2,4 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 openstackdocstheme>=1.20.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD

lower-constraints.txt

@@ -16,7 +16,7 @@ extras==1.0.0
 fixtures==3.0.0
 flake8==2.5.5
 hacking==0.12.0
-idna==2.6
+idna==2.5
 imagesize==0.7.1
 iso8601==0.1.11
 Jinja2==2.10
@@ -64,7 +64,7 @@ python-subunit==1.0.0
 python-swiftclient==3.2.0
 pytz==2013.6
 PyYAML==3.12
-requests==2.14.2
+requests==2.18.0
 requestsexceptions==1.2.0
 simplejson==3.5.1
 six==1.10.0

requirements.txt

@@ -12,6 +12,6 @@ keystoneauth1>=3.4.0 # Apache-2.0
 python-novaclient>=9.1.0 # Apache-2.0
 python-heatclient>=1.10.0 # Apache-2.0
 python-glanceclient>=2.8.0 # Apache-2.0
-requests>=2.14.2 # Apache-2.0
+requests>=2.18.0 # Apache-2.0
 
 oslo.log>=3.36.0 # Apache-2.0

setup.cfg

@@ -6,6 +6,7 @@ description-file =
 author = OpenStack
 author-email = openstack-discuss@lists.openstack.org
 home-page = http://docs.openstack.org/heat-translator/
+python-requires = >=3.6
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -13,11 +14,11 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: Implementation :: CPython
 
 [files]
 packages =

setup.py

@@ -16,14 +16,6 @@
 # THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
-# In python < 2.7.4, a lazy loading of package `pbr` will break
-# setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
-try:
-    import multiprocessing  # noqa
-except ImportError:
-    pass
-
 setuptools.setup(
     setup_requires=['pbr>=2.0.0'],
     pbr=True)

tox.ini

@@ -1,11 +1,12 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.0
-envlist = py27,py37,pep8
+envlist = py37,pep8
+ignore_basepython_conflict = true
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
-install_command = pip install {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
@@ -17,29 +18,25 @@ deps =
 commands = python setup.py test --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 commands = python setup.py test --coverage --coverage-package-name=translator --testr-args='{posargs}'
 
 [testenv:docs]
-basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -b html doc/source doc/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper -t translator/tests {posargs}
 
-[testenv:py27-tp]
+[testenv:py37-tp]
+basepython = python37
 commands =
-    ./run_py27-tosca-parser-master.sh
+    ./run_py-tosca-parser-master.sh
     python setup.py test --slowest --testr-args='{posargs}'
 
 [flake8]