Removed cache from jenkins settings since it's set elsewhere.

scripts/run_mkt_tests.sh

@@ -72,7 +72,6 @@ DATABASES['default']['ENGINE'] = 'mysql_pool'
 DATABASES['default']['TEST_NAME'] = 'test_zamboni_$1'
 DATABASES['default']['TEST_CHARSET'] = 'utf8'
 DATABASES['default']['TEST_COLLATION'] = 'utf8_general_ci'
-CACHE_BACKEND = 'caching.backends.locmem://'
 CELERY_ALWAYS_EAGER = True
 RUN_ES_TESTS = ${RUN_ES_TESTS}
 ADDONS_PATH = '/tmp/warez'