Check that using subpage_urls raises deprecation
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marctc/wagtail,m-sanders/wagtail,takeshineshiro/wagtail,bjesus/wagtail,hanpama/wagtail,bjesus/wagtail,nealtodd/wagtail,rsalmaso/wagtail,kurtw/wagtail,mixxorz/wagtail,rjsproxy/wagtail,takeflight/wagtail,kurtrwall/wagtail,gogobook/wagtail,mikedingjan/wagtail,serzans/wagtail,serzans/wagtail,FlipperPA/wagtail,hanpama/wagtail,hanpama/wagtail,mixxorz/wagtail,taedori81/wagtail,Tivix/wagtail,gogobook/wagtail,mikedingjan/wagtail,iho/wagtail,Pennebaker/wagtail,taedori81/wagtail,iansprice/wagtail,jordij/wagtail,mjec/wagtail,gasman/wagtail,Klaudit/wagtail,mikedingjan/wagtail,rv816/wagtail,bjesus/wagtail,davecranwell/wagtail,kaedroho/wagtail,timorieber/wagtail,mayapurmedia/wagtail,mephizzle/wagtail,WQuanfeng/wagtail,iansprice/wagtail,mjec/wagtail,torchbox/wagtail,hamsterbacke23/wagtail,m-sanders/wagtail,nutztherookie/wagtail,rv816/wagtail,rsalmaso/wagtail,quru/wagtail,jnns/wagtail,Klaudit/wagtail,timorieber/wagtail,nealtodd/wagtail,rjsproxy/wagtail,Tivix/wagtail,kurtw/wagtail,timorieber/wagtail,tangentlabs/wagtail,Toshakins/wagtail,janusnic/wagtail,nilnvoid/wagtail,m-sanders/wagtail,KimGlazebrook/wagtail-experiment,chrxr/wagtail,mixxorz/wagtail,gasman/wagtail,thenewguy/wagtail,marctc/wagtail,FlipperPA/wagtail,tangentlabs/wagtail,bjesus/wagtail,takeflight/wagtail,Toshakins/wagtail,darith27/wagtail,torchbox/wagtail,nrsimha/wagtail,nimasmi/wagtail,jordij/wagtail,nealtodd/wagtail,wagtail/wagtail,kurtrwall/wagtail,wagtail/wagtail,mayapurmedia/wagtail,zerolab/wagtail,thenewguy/wagtail,mephizzle/wagtail,nilnvoid/wagtail,kurtrwall/wagtail,chrxr/wagtail,darith27/wagtail,darith27/wagtail,mjec/wagtail,taedori81/wagtail,wagtail/wagtail,mixxorz/wagtail,inonit/wagtail,Tivix/wagtail,rv816/wagtail,nimasmi/wagtail,JoshBarr/wagtail,takeshineshiro/wagtail,nutztherookie/wagtail,iho/wagtail,hamsterbacke23/wagtail,chrxr/wagtail,zerolab/wagtail,kaedroho/wagtail,janusnic/wagtail,chrxr/wagtail,nutztherookie/wagtail,nrsimha/wagtail,KimGlazebrook/wagtail-experiment,jordij/wagtail,nilnvoid/wagtail,mayapurmedia/wagtail,JoshBarr/wagtail,JoshBarr/wagtail,Pennebaker/wagtail,zerolab/wagtail,rjsproxy/wagtail,inonit/wagtail,FlipperPA/wagtail,takeshineshiro/wagtail,mixxorz/wagtail,mikedingjan/wagtail,Klaudit/wagtail,nimasmi/wagtail,JoshBarr/wagtail,takeshineshiro/wagtail,Toshakins/wagtail,marctc/wagtail,iansprice/wagtail,takeflight/wagtail,torchbox/wagtail,FlipperPA/wagtail,gasman/wagtail,davecranwell/wagtail,davecranwell/wagtail,jnns/wagtail,inonit/wagtail,rv816/wagtail,thenewguy/wagtail,jnns/wagtail,mayapurmedia/wagtail,thenewguy/wagtail,rjsproxy/wagtail,tangentlabs/wagtail,nimasmi/wagtail,iho/wagtail,nilnvoid/wagtail,Tivix/wagtail,nealtodd/wagtail,hamsterbacke23/wagtail,nrsimha/wagtail,Toshakins/wagtail,hamsterbacke23/wagtail,quru/wagtail,m-sanders/wagtail,stevenewey/wagtail,rsalmaso/wagtail,jnns/wagtail,kurtw/wagtail,iho/wagtail,gogobook/wagtail,kaedroho/wagtail,stevenewey/wagtail,janusnic/wagtail,stevenewey/wagtail,rsalmaso/wagtail,tangentlabs/wagtail,torchbox/wagtail,KimGlazebrook/wagtail-experiment,gasman/wagtail,wagtail/wagtail,kaedroho/wagtail,mephizzle/wagtail,KimGlazebrook/wagtail-experiment,jordij/wagtail,gasman/wagtail,stevenewey/wagtail,hanpama/wagtail,Pennebaker/wagtail,inonit/wagtail,Pennebaker/wagtail,wagtail/wagtail,gogobook/wagtail,takeflight/wagtail,mjec/wagtail,timorieber/wagtail,nrsimha/wagtail,janusnic/wagtail,kaedroho/wagtail,mephizzle/wagtail,serzans/wagtail,iansprice/wagtail,darith27/wagtail,marctc/wagtail,quru/wagtail,kurtw/wagtail,WQuanfeng/wagtail,Klaudit/wagtail,zerolab/wagtail,WQuanfeng/wagtail,quru/wagtail,nutztherookie/wagtail,kurtrwall/wagtail,thenewguy/wagtail,taedori81/wagtail,davecranwell/wagtail,rsalmaso/wagtail,WQuanfeng/wagtail,taedori81/wagtail,serzans/wagtail,zerolab/wagtail