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
3 files changed