[2967] removed Auth/database_file from lettuce slave configs

but not master configs or xfrin_bind10.feature, since xfrout hasn't
been converted to the general data source yet

tests/lettuce/configurations/xfrin/retransfer_slave.conf.orig

@@ -8,7 +8,6 @@
         } ]
     },
     "Auth": {
-        "database_file": "data/test_nonexistent_db.sqlite3",
         "listen_on": [ {
             "address": "::1",
             "port": 47806

tests/lettuce/configurations/xfrin/retransfer_slave_diffs.conf

@@ -8,7 +8,6 @@
         } ]
     },
     "Auth": {
-        "database_file": "data/xfrin-before-diffs.sqlite3",
         "listen_on": [ {
             "address": "::1",
             "port": 47806

tests/lettuce/configurations/xfrin/retransfer_slave_notify.conf.orig

@@ -8,7 +8,6 @@
         } ]
     },
     "Auth": {
-        "database_file": "data/xfrin-notify.sqlite3",
         "listen_on": [ {
             "address": "::1",
             "port": 47806

tests/lettuce/configurations/xfrin/retransfer_slave_notify_v4.conf

@@ -8,7 +8,6 @@
         } ]
     },
     "Auth": {
-        "database_file": "data/xfrin-notify.sqlite3",
         "listen_on": [ {
             "address": "127.0.0.1",
             "port": 47806