package/confd: support for customer factory startup-config.cfg

When researching the systemd tmpfiles.d implementation I discovered the
effort to standarize on /usr/share/factory as a generic factory defaults
for Linux systems.  This patch adds a small example factory.cfg file
that is installed as /usr/share/factory/cfg/startup-config.cfg.  The
tmpfiles.d backend will then install it as /cfg/startup-config.cfg if
that file is missing at boot.  Confd does the rest to bootstrap our
(by default) empty sysrepo db with this startup-config.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

package/confd/confd.mk

@@ -15,6 +15,8 @@ define CONFD_INSTALL_EXTRA
 	cp $(CONFD_PKGDIR)/sysrepo.conf  $(FINIT_D)/available/
 	ln -sf ../available/sysrepo.conf $(FINIT_D)/enabled/sysrepo.conf
 	cp $(CONFD_PKGDIR)/tmpfiles.conf $(TARGET_DIR)/etc/tmpfiles.d/confd.conf
+	mkdir -p $(TARGET_DIR)/usr/share/factory/cfg
+	cp $(CONFD_PKGDIR)/factory.cfg   $(TARGET_DIR)/usr/share/factory/cfg/startup-config.cfg
 	mkdir -p $(TARGET_DIR)/lib/infix
 	cp $(CONFD_PKGDIR)/prep-db       $(TARGET_DIR)/lib/infix/
 	cp $(CONFD_PKGDIR)/clean-etc     $(TARGET_DIR)/lib/infix/

package/confd/factory.cfg

@@ -0,0 +1,5 @@
+{
+  "ietf-system:system": {
+    "hostname": "default"
+  }
+}

package/confd/tmpfiles.conf

@@ -1 +1,2 @@
 d  /run/resolvconf/interfaces	- - -
+C  /cfg/startup-config.cfg	- - -