About the config files (docbook-xsl.xml), we refered what Ubuntu 13.04 did,
so the xmlto could correctly search the xsl stylesheets.
[YOCTO #2416]
(From OE-Core rev: f5554492c80c69ba9b34dbf206a7c748ab8f1fb6)
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>