Override the ENV during the unit tests

Author: hutchic

.travis.yml

@@ -74,6 +74,7 @@ jobs:
       - bin/busted -v -o gtest spec/01-unit
       - bin/busted -v -o gtest spec-old-api/01-unit
       env:
+        - KONG_TEST_PG_DATABASE=foobar
         - KONG_DATABASE=none
     - stage: pdk tests
       script: TEST_NGINX_RANDOMIZE=1 prove -I. -j$JOBS -r t/01-pdk