ignore nfs and sub{u/g}id files in mtree (#847)

scale_build/image/mtree.py

@@ -33,11 +33,14 @@ ETC_FILES_TO_REMOVE = [
     'etc/chrony/chrony.conf',
     'etc/default/rpcbind',
     'etc/netdata/netdata.conf',
+    'etc/nfs.conf',
     'etc/nginx/nginx.conf',
     'etc/proftpd/proftpd.conf',
     'etc/proftpd/tls.conf',
     'etc/snmp/snmpd.conf',
     'etc/ssh/sshd_config',
+    'etc/subuid',
+    'etc/subgid',
     'etc/syslog-ng/syslog-ng.conf',
     'etc/rc2.d/K01ssh',             # systemd removes these symlinks on ssh start
     'etc/rc3.d/K01ssh',
@@ -92,6 +95,7 @@ def _do_mtree_impl(mtree_file_path, version):
             '--exclude', './etc/passwd',
             '--exclude', './etc/shadow',
             '--exclude', './etc/sudoers',
+            '--exclude', './etc/nfs.conf.d',
             '--exclude', './etc/nut',
             '--exclude', './etc/dhcp/dhclient.conf',
             '--exclude', './etc/pam.d/common-account',