EOL SLE HA 15 SP2: Switch validation to DocBook 5.2 (#426) #1589

Job	Run time
select-dc-files	20s
validate (./DC-SLE-HA-all ./l10n/de-de/DC-SLE-HA-all)	22s
validate (./l10n/es-es/DC-SLE-HA-all)	19s
validate (./l10n/fr-fr/DC-SLE-HA-all)	19s
validate (./l10n/it-it/DC-SLE-HA-all)	20s
validate (./l10n/ja-jp/DC-SLE-HA-all)	2m 6s
validate (./l10n/pt-br/DC-SLE-HA-all)	24s
validate (./l10n/zh-cn/DC-SLE-HA-all)	19s
validate (./l10n/zh-tw/DC-SLE-HA-all)	24s
build-html (DC-SLE-HA-geo-guide)	54s
build-html (DC-SLE-HA-geo-quick)	50s
build-html (DC-SLE-HA-guide)	1m 24s
build-html (DC-SLE-HA-install-quick)	58s
build-html (DC-SLE-HA-nfs-quick)	1m 9s
build-html (DC-SLE-HA-pmremote-quick)	1m 52s
publish	55s
	12m 55s

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