fix: correct issues in upgrade and fix tests

tests/service_unlink.bats

@@ -52,7 +52,7 @@ teardown() {
     check_value="Deploy options: --restart=on-failure:10"
   fi
 
-  options=$(dokku $report_action my_app | xargs)
+  options=$(dokku --quiet $report_action my_app | xargs)
   assert_equal "$options" "$check_value"
 }
 

tests/test_helper.bash

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-export DOKKU_QUIET_OUTPUT=1
 export DOKKU_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/dokku"
 export DOKKU_VERSION=${DOKKU_VERSION:-"master"}
 export PATH="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/bin:$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/dokku:$PATH"