Remove unnecessary removal of pyc files

In change I8fcd9370a6adbfe8bbb2ce441a6f2efad45d089a, we started setting
the 'PYTHONDONTWRITEBYTECODE=1' flag. With this set, Python won't
generate pyc files. As these files aren't generated, there's no need to
remove them. Remove the 'find' calls that were doing this.

Change-Id: Ifd4487c4566853244c4b2c90a178b1067c17fbc6
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

tox.ini

@@ -13,11 +13,9 @@ deps =
   -r{toxinidir}/test-requirements.txt
   .[ldap,memcache,mongodb]
 commands =
-  find keystone -type f -name "*.pyc" -delete
   stestr run {posargs}
 allowlist_externals =
   bash
-  find
 passenv = http_proxy,HTTP_PROXY,https_proxy,HTTPS_PROXY,no_proxy,NO_PROXY,PBR_VERSION
 
 [testenv:pep8]
@@ -55,7 +53,6 @@ setenv =
   {[testenv]setenv}
   PYTHON=coverage run --source keystone --parallel-mode
 commands =
-  find keystone -type f -name "*.pyc" -delete
   stestr run {posargs}
   coverage combine
   coverage html -d cover
@@ -70,7 +67,6 @@ commands = {posargs}
 
 [testenv:debug]
 commands =
-  find keystone -type f -name "*.pyc" -delete
   oslo_debug_helper {posargs}
 passenv = KSTEST_*
 
@@ -80,7 +76,6 @@ deps =
   -r{toxinidir}/test-requirements.txt
 setenv = OS_TEST_PATH=./keystone/tests/functional
 commands =
-  find keystone -type f -name "*.pyc" -delete
   stestr run {posargs}
   stestr slowest
 passenv = KSTEST_*
@@ -182,5 +177,4 @@ commands = bindep test
 
 [testenv:protection]
 commands =
-  find keystone -type f -name "*.pyc" -delete
   stestr run --test-path=./keystone/tests/protection {posargs}