partially fix tests/integration/app_version.bats

tests/integration/app_version.bats

@@ -92,7 +92,7 @@ teardown(){
   assert_success
 
  # NOTE(d1): to let the stack come down before nuking volumes
-  sleep 3
+  sleep 5
 
   run $ABRA app volume remove "$appDomain" --no-input
   assert_success

tests/integration/helpers/server.bash

@@ -11,7 +11,11 @@ _add_server() {
 }
 
 _rm_server() {
-  run $ABRA server remove --no-input "$TEST_SERVER"
+  if [[ "$TEST_SERVER" == "default" ]]; then
+      run rm -rf "$ABRA_DIR/servers/default"
+  else
+      run $ABRA server remove --no-input "$TEST_SERVER"
+  fi
   assert_success
   assert_not_exists "$ABRA_DIR/servers/$TEST_SERVER"
 }