Update CHANGELOG.md for 8.17.2
Update CHANGELOG.md for 8.17.2

[ci skip]
dreampet/gitlab,LUMC/gitlabhq,LUMC/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,dplarson/gitlabhq,axilleas/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,htve/GitlabForChinese,LUMC/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,iiet/iiet-git,darkrasid/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,stoplightio/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,dreampet/gitlab,axilleas/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,htve/GitlabForChinese