Travis configuration now does extra tag validation

Separate build matrix into 3 stages - verify-tag, test, and deploy
- verify-tag compares the kubernetes.__version__ to $TRAVIS_TAG. Only
runs on pushed tags
- test runs the actual tests
- deploy deploys the package to pypi. Only runs on pushed tags

Author: fabianvf

.travis.yml

@@ -3,44 +3,61 @@ dist: xenial
 sudo: true
 services:
 - docker
-matrix:
-    include:
-     - python: 2.7
-       env: TOXENV=py27
-     - python: 2.7
-       env: TOXENV=py27-functional
-     - python: 2.7
-       env: TOXENV=update-pycodestyle
-     - python: 2.7
-       env: TOXENV=docs
-     - python: 2.7
-       env: TOXENV=coverage,codecov
-     - python: 3.4
-       env: TOXENV=py34
-     - python: 3.5
-       env: TOXENV=py35
-     - python: 3.5
-       env: TOXENV=py35-functional
-     - python: 3.6
-       env: TOXENV=py36
-     - python: 3.6
-       env: TOXENV=py36-functional
-     - python: 3.7
-       env: TOXENV=py37
-     - python: 3.7
-       env: TOXENV=py37-functional
 
 install:
 - pip install tox
+
 script:
 - tox
-deploy:
-  provider: pypi
-  user: __token__
-  password:
-    secure: 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
-  skip_existing: true
-  on:
-    tags: true
-    repo: kubernetes-client/python
-  distributions: sdist bdist_wheel
+
+jobs:
+  include:
+  - stage: verify-tag
+    python: 3.7
+    script: [ "v$(python -c 'import kubernetes ; print(kubernetes.__version__)')" == "${TRAVIS_TAG}" ]
+  - stage: test
+    python: 2.7
+    env: TOXENV=update-pycodestyle
+  - python: 3.7
+    env: TOXENV=docs
+  - python: 2.7
+    env: TOXENV=coverage,codecov
+  - python: 2.7
+    env: TOXENV=py27
+  - python: 2.7
+    env: TOXENV=py27-functional
+  - python: 3.5
+    env: TOXENV=py35
+  - python: 3.5
+    env: TOXENV=py35-functional
+  - python: 3.6
+    env: TOXENV=py36
+  - python: 3.6
+    env: TOXENV=py36-functional
+  - python: 3.7
+    env: TOXENV=py37
+  - python: 3.7
+    env: TOXENV=py37-functional
+  - python: 3.8
+    env: TOXENV=py38
+  - python: 3.8
+    env: TOXENV=py38-functional
+  - stage: deploy
+    script: skip
+    deploy:
+      provider: pypi
+      user: __token__
+      password:
+        secure: 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
+      skip_existing: true
+      on:
+        tags: true
+        repo: kubernetes-client/python
+      distributions: sdist bdist_wheel
+
+stages:
+- name: verify-tag
+  if: (tag is present) and (type = push)
+- test
+- name: deploy
+  if: (tag is present) and (type = push)