manuals: generate vty reference xml at build time

Move 'doc' subdir further down to "make sure" the osmo-hlr binary is built
before the docs

Remove hlr_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-hlr --vty-ref-xml cmdline switch.

Change-Id: I02c9862ced48ce4271b328a0963d5f09086b295c
Depends: I613d692328050a036d05b49a436ab495fc2087ba
Related: OS#5041

Makefile.am

@@ -1,9 +1,9 @@
 AUTOMAKE_OPTIONS = foreign dist-bzip2
 
 SUBDIRS = \
-	doc \
 	src \
 	include \
+	doc \
 	sql \
 	contrib \
 	tests \

doc/manuals/Makefile.am

@@ -14,6 +14,12 @@ if BUILD_MANUALS
   include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.asciidoc.inc
 
   VTY_REFERENCE = osmohlr-vty-reference.xml
+
+  BUILT_REFERENCE_XML = $(builddir)/vty/hlr_vty_reference.xml
+  $(builddir)/vty/hlr_vty_reference.xml: $(top_builddir)/src/osmo-hlr
+	mkdir -p $(builddir)/vty
+	$(top_builddir)/src/osmo-hlr --vty-ref-xml > $@
+
   include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.vty-reference.inc
 
   OSMO_REPOSITORY = osmo-hlr