add pbs-systemd: move string and unit handling there

the systemd config/unit parsing stays in pbs for now since
that's not usually required and uses our section config
parser

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

Makefile

@@ -35,6 +35,7 @@ SUBCRATES := \
 	pbs-buildcfg \
 	pbs-datastore \
 	pbs-runtime \
+	pbs-systemd \
 	pbs-tools
 
 ifeq ($(BUILD_MODE), release)