manuals: generate vty reference xml at build time

Rremove osmo-stp_vty_reference from the source tree.

In manuals/Makefile.am use the new BUILT_REFERENCE_XML feature recently added
to osmo-gsm-manuals, and add a build target to generate the XML using the new
osmo-stp --vty-ref-xml cmdline switch.

Change-Id: I5bcbbdf7b737d2ce36ea877bc78c8cf191a64e1b
Depends: I613d692328050a036d05b49a436ab495fc2087ba
Related: OS#5041

doc/manuals/Makefile.am

@@ -12,6 +12,12 @@ if BUILD_MANUALS
   aoip-mgw-options.pdf: $(srcdir)/aoip-mgw-options.adoc $(srcdir)/mgw/*.msc
 
   VTY_REFERENCE = osmostp-vty-reference.xml
+
+  BUILT_REFERENCE_XML = $(builddir)/vty/osmo-stp_vty_reference.xml
+  $(builddir)/vty/osmo-stp_vty_reference.xml: $(top_builddir)/stp/osmo-stp
+	mkdir -p $(builddir)/vty
+	$(top_builddir)/stp/osmo-stp --vty-ref-xml > $@
+
   include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.vty-reference.inc
 
   OSMO_REPOSITORY=osmo-stp

doc/manuals/vty/osmo-stp_additions.xml

@@ -0,0 +1,2 @@
+<vtydoc xmlns='urn:osmocom:xml:libosmocore:vty:doc:1.0'>
+</vtydoc>