The virtlockd daemon scripts were lousy, when compared to their
counterparts in daemon/Makefile.am.  In particular, when init
scripts were selected, this resulted in 'make distcheck' failing
due to failure to clean up src/virtlockd.init.

* src/Makefile.am (install-systemd): Fix dependencies.  Use MKDIR_P.
(uninstall-systemd): Remove empty directory.  Use fewer processes.
(install-init, install-sysconfig): Use MKDIR_P.
(uninstall-init): Remove correct file, and also empty directory.
(uninstall-sysconfig): Remove empty directory.
(DISTCLEANFILES): Clean up trivially built sources.