Add nfsd.service

The file nfsd.service is currenty untracked.

Import it into mxtools. This is preferred to the option of including it
in the nfs_tools bee package, because it contains local configuration
(e.g. the number 64 for the nproc argument) and we don't want to rebuild
the bee package because of small configuration changes.

Also add file to install script.

install.sh

@@ -135,4 +135,5 @@ install_exec fon/fon.sh                                  "$DESTDIR$usr_bindir/fo
 install_exec nfsdtop/nfsdtop                             "$DESTDIR$usr_sbindir/nfsdtop"
 install_data serial-log/serial-log\@.service             "$DESTDIR$systemdunitdir/serial-log@.service"
 install_exec serial-log/serial-log                       "$DESTDIR$usr_exec_prefix/libexec/serial-log"
+install_data misc_systemd_units/nfsd.service             "$DESTDIR$systemdunitdir/nfsd.service"
 exit

misc_systemd_units/nfsd.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=NFS Daemon
+ConditionPathExists=/etc/exports
+Requires=local-fs.target proc-fs-nfsd.mount var-lib-nfs-rpc_pipefs.mount unbound.service
+After=local-fs.target proc-fs-nfsd.mount var-lib-nfs-rpc_pipefs.mount unbound.service
+
+[Service]
+ExecStartPre=/bin/mkdir -p /var/lib/nfs/v4recovery
+ExecStartPre=/usr/sbin/exportfs -ra
+ExecStart=/usr/sbin/rpc.mountd --foreground --manage-gids
+ExecStartPost=/usr/sbin/rpc.nfsd -N 3 64 ; /usr/sbin/sm-notify
+ExecReload=/usr/sbin/exportfs -ra
+ExecStopPost=/usr/sbin/rpc.nfsd 0 ; /usr/sbin/exportfs -ua
+Restart=always
+
+[Install]
+WantedBy=multi-user.target