Drop python3.5 support

Now that we released ussuri, we have a stable release that supports
3.5. That means if needed we can backport changes needed for
zuul and nodepool, so it should be safe to go ahead and drop 3.5
support.

Change-Id: Iaa761cb6f6ab30fa26f6587ac29f11274702e1a3

.zuul.yaml

@@ -361,7 +361,6 @@
     templates:
       - check-requirements
       - openstack-lower-constraints-jobs
-      - openstack-python35-jobs
       - openstack-python3-ussuri-jobs
       - openstacksdk-functional-tips
       - openstacksdk-tox-tips

doc/source/contributor/setup.rst

@@ -34,15 +34,13 @@ as an administrator in some situations.::
 
 You can create a virtualenv in any location. A common usage is to store all
 of your virtualenvs in the same place, such as under your home directory.
-To create a virtualenv for the default Python, likely a version 2, run
-the following::
+To create a virtualenv for the default Python, run the following::
 
    $ virtualenv $HOME/envs/sdk
 
-To create an environment for a different version, such as Python 3, run
-the following::
+To create an environment for a different version, run the following::
 
-   $ virtualenv -p python3.5 $HOME/envs/sdk3
+   $ virtualenv -p python3.8 $HOME/envs/sdk3
 
 When you want to enable your environment so that you can develop inside of it,
 you *activate* it. To activate an environment, run the /bin/activate

doc/source/contributor/testing.rst

@@ -14,15 +14,14 @@ Run
 
 In order to run the entire unit test suite, simply run the ``tox`` command
 inside of your source checkout. This will attempt to run every test command
-listed inside of ``tox.ini``, which includes Python 2.7, 3.5,
-and a PEP 8 check. You should run the full test suite on all versions before
+listed inside of ``tox.ini``, which includes Python 3.8, and a PEP 8 check.
+You should run the full test suite on all versions before
 submitting changes for review in order to avoid unexpected failures in the
 continuous integration system.::
 
    (sdk3)$ tox
    ...
-   py35: commands succeeded
-   py27: commands succeeded
+   py38: commands succeeded
    pep8: commands succeeded
    congratulations :)
 
@@ -30,8 +29,8 @@ During development, it may be more convenient to run a subset of the tests
 to keep test time to a minimum. You can choose to run the tests only on one
 version. A step further is to run only the tests you are working on.::
 
-   (sdk3)$ tox -e py35                # Run run the tests on Python 3.5
-   (sdk3)$ tox -e py35 TestContainer  # Run only the TestContainer tests on 3.5
+   (sdk3)$ tox -e py38                # Run run the tests on Python 3.8
+   (sdk3)$ tox -e py38 TestContainer  # Run only the TestContainer tests on 3.8
 
 Functional Tests
 ----------------

releasenotes/notes/dropped-python-3.5-b154887cce87947c.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Python 3.5 is no longer supported.

setup.cfg

@@ -14,11 +14,10 @@ classifier =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
-python-requires = >=3.5
+python-requires = >=3.6
 
 [files]
 packages =

tox.ini

@@ -130,7 +130,3 @@ deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
-
-[testenv:py35]
-basepython = python3.5
-deps = {[testenv:lower-constraints]deps}