Changed py39 from py27 in tox

Changed py39 from py27 in tox for contributing doc

Change-Id: Ia079b7b7f5d96858c7dfe4b3d103c0efd86ae68b

CONTRIBUTING.rst

@@ -258,8 +258,7 @@ following on your development system and ensure that they pass.
 .. code-block:: bash
 
     $ tox -e pep8
-    $ tox -e py27
-    $ tox -e py34
+    $ tox -e py39
     $ tox -e pylint
 
 If you are unable to get these to pass locally, it is a waste of the
@@ -294,11 +293,11 @@ To run all tests and PEP8, run tox, like so:
 
     $ tox
 
-To run just the tests for Python 2.7, run:
+To run just the tests for Python 3.9, run:
 
 .. code-block:: bash
 
-    $ tox -epy27
+    $ tox -epy39
 
 To run just PEP8, run:
 

tools/start-fake-mode.sh

@@ -2,12 +2,12 @@
 # Arguments: Use --pid_file to specify a pid file location.
 
 
-if [ ! -d ".tox/py27" ]; then
-    tox -epy27
+if [ ! -d ".tox/py39" ]; then
+    tox -epy39
 fi
 
 function run() {
-    .tox/py27/bin/python $@
+    .tox/py39/bin/python $@
 }
 run bin/trove-manage \
     --config-file=etc/trove/trove.conf.test db_recreate \