remove pyc files before running tests

pyc files for old code files and test files won't get removed from the
local tree when those files are removed. They will still be discovered
and used when running tox tests.

This removes pyc files before running tests to ensure that test
results are repeatble by end users even if they are updating older git
trees.

Closes-Bug: #1551312

Change-Id: I9987cc57dc9ac2bd0331af6cb59e2c5e137d9849

tox.ini

@@ -9,12 +9,16 @@ install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
        .[ldap,memcache,mongodb]
-commands = bash tools/pretty_tox.sh '{posargs}'
+commands =
+  find keystone -type f -name "*.pyc" -delete
+  bash tools/pretty_tox.sh '{posargs}'
 whitelist_externals = bash
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY PBR_VERSION
 
 [testenv:py34]
-commands = bash tools/pretty_tox_py3.sh
+commands =
+  find keystone -type f -name "*.pyc" -delete
+  bash tools/pretty_tox_py3.sh
 
 [testenv:legacy_drivers]
 deps = -r{toxinidir}/test-requirements.txt
@@ -22,6 +26,7 @@ deps = -r{toxinidir}/test-requirements.txt
        .[ldap,memcache,mongodb]
 commands =
   # Run each legacy test separately, to avoid SQL model redefinitions
+  find keystone -type f -name "*.pyc" -delete
   nosetests -v \
       keystone/tests/unit/backend/legacy_drivers/assignment/V8/sql.py
   nosetests -v \
@@ -53,13 +58,17 @@ deps = .[bandit]
 commands = bandit -r keystone
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+commands =
+  find keystone -type f -name "*.pyc" -delete
+  python setup.py testr --coverage --testr-args='{posargs}'
 
 [testenv:venv]
 commands = {posargs}
 
 [testenv:debug]
-commands = oslo_debug_helper {posargs}
+commands =
+  find keystone -type f -name "*.pyc" -delete
+  oslo_debug_helper {posargs}
 passenv =
     KSTEST_ADMIN_URL
     KSTEST_ADMIN_USERNAME
@@ -75,7 +84,9 @@ passenv =
 basepython = python3.4
 deps = -r{toxinidir}/test-requirements.txt
 setenv = OS_TEST_PATH=./keystone/tests/functional
-commands = python setup.py testr --slowest --testr-args='{posargs}'
+commands =
+  find keystone -type f -name "*.pyc" -delete
+  python setup.py testr --slowest --testr-args='{posargs}'
 passenv =
     KSTEST_ADMIN_URL
     KSTEST_ADMIN_USERNAME