godoc/redirect: if id in /cl/{id} is less than 150k, treat as Gerrit CL id
godoc/redirect: if id in /cl/{id} is less than 150k, treat as Gerrit CL id

Change-Id: Id69c00d908d18151486007ec03da5495b34b05f5
Reviewed-on: https://go-review.googlesource.com/1223
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

cw2018/tools,cmars/tools,maddyonline/tools,sshetty10/tools,cmars/tools,dmitris/tools,magiccao/tools,syreclabs/go-tools,josharian/tools,magiccao/tools,syreclabs/go-tools,magiccao/tools,josharian/tools,argandas/tools,matryer/tools,matryer/tools,matryer/tools,springning/tools,sshetty10/tools,sshetty10/tools,glasser/golang-tools,golang/tools,golang/tools,golang/tools,nicot/tools,springning/tools,jdhenke/tools,argandas/tools,argandas/tools,dmitris/tools,cmars/tools,josharian/tools,nicot/tools,golang/tools,cw2018/tools,jdhenke/tools,nicot/tools,golang/tools,dmitris/tools,jdhenke/tools,maddyonline/tools,syreclabs/go-tools,nicot/tools,maddyonline/tools,glasser/golang-tools,syreclabs/go-tools,syreclabs/go-tools,4ad/tools,runcom/tools,josharian/tools,matryer/tools,runcom/tools,argandas/tools,dmitris/tools,sshetty10/tools,springning/tools,springning/tools,maddyonline/tools,jdhenke/tools,cw2018/tools,magiccao/tools,cmars/tools,glasser/golang-tools,syreclabs/go-tools,glasser/golang-tools,4ad/tools,4ad/tools,cw2018/tools,runcom/tools,runcom/tools