mapper: install systemd unit, dbus conf files

The same systemd and dbus unit/configuration files can work for everyone
now, so ship them.  Enable dbus activation, add unit file templates, and
move mapperx to libexec where it belongs.

Change-Id: Ieb021889605767ffdb9d72faad5f5b856312b935
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/src/systemd/mapper-subtree-remove@.service.in b/src/systemd/mapper-subtree-remove@.service.in
new file mode 100644
index 0000000..c6a224b
--- /dev/null
+++ b/src/systemd/mapper-subtree-remove@.service.in
@@ -0,0 +1,9 @@
+[Unit]
+Description=mapper subtree-remove %I
+
+[Service]
+Type=oneshot
+RemainAfterExit=no
+Restart=on-failure
+TimeoutStartSec=infinity
+ExecStart=@BINDIR@/mapper subtree-remove %I