[1090] Remove old config from tests also

It did not make the tests fail, but it is still better not to have them
if they are not supported.

tests/system/bindctl/nsx1/b10-config.db.template.in

@@ -3,8 +3,5 @@
    "listen_on": [{"address": "10.53.0.1", "port": 53210}],
    "database_file": "@abs_builddir@/zone.sqlite3",
    "statistics-interval": 1
- },
- "Xfrout": {
-   "log_file": "@abs_builddir@/Xfrout.log"
  }
 }

tests/system/glue/nsx1/b10-config.db.in

@@ -2,8 +2,5 @@
  "Auth": {
    "listen_on": [{"address": "10.53.0.1", "port": 53210}],
    "database_file": "@abs_builddir@/zone.sqlite3"
- },
- "Xfrout": {
-   "log_file": "@abs_builddir@/Xfrout.log"
  }
 }