Allow the default port to be more easily configured.
Allow the default port to be more easily configured.

Docker images and other automation use cases often want to make Jenkins
use specific port. Today they do this via init.groovy.d with a
problematic sleep timeout, so allow them to control this value via
system property.

pjanouse/jenkins,ikedam/jenkins,evernat/jenkins,godfath3r/jenkins,fbelzunc/jenkins,Jochen-A-Fuerbacher/jenkins,bpzhang/jenkins,DanielWeber/jenkins,godfath3r/jenkins,bpzhang/jenkins,varmenise/jenkins,olivergondza/jenkins,gusreiber/jenkins,godfath3r/jenkins,SebastienGllmt/jenkins,ErikVerheul/jenkins,ikedam/jenkins,viqueen/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,daniel-beck/jenkins,csimons/jenkins,patbos/jenkins,jpbriend/jenkins,ErikVerheul/jenkins,batmat/jenkins,stephenc/jenkins,patbos/jenkins,DanielWeber/jenkins,Jimilian/jenkins,amuniz/jenkins,bpzhang/jenkins,Jimilian/jenkins,protazy/jenkins,bpzhang/jenkins,ikedam/jenkins,batmat/jenkins,christ66/jenkins,rlugojr/jenkins,ydubreuil/jenkins,MarkEWaite/jenkins,ikedam/jenkins,Jochen-A-Fuerbacher/jenkins,alvarolobato/jenkins,escoem/jenkins,sathiya-mit/jenkins,recena/jenkins,jenkinsci/jenkins,wuwen5/jenkins,MichaelPranovich/jenkins_sc,rlugojr/jenkins,MarkEWaite/jenkins,vjuranek/jenkins,escoem/jenkins,MichaelPranovich/jenkins_sc,Jochen-A-Fuerbacher/jenkins,dariver/jenkins,DanielWeber/jenkins,tangkun75/jenkins,gitaccountforprashant/gittest,MarkEWaite/jenkins,gusreiber/jenkins,patbos/jenkins,Vlatombe/jenkins,Ykus/jenkins,gusreiber/jenkins,NehemiahMi/jenkins,kohsuke/hudson,Vlatombe/jenkins,evernat/jenkins,bkmeneguello/jenkins,azweb76/jenkins,rsandell/jenkins,samatdav/jenkins,amruthsoft9/Jenkis,varmenise/jenkins,gusreiber/jenkins,damianszczepanik/jenkins,evernat/jenkins,ajshastri/jenkins,rlugojr/jenkins,MichaelPranovich/jenkins_sc,daniel-beck/jenkins,amruthsoft9/Jenkis,lilyJi/jenkins,stephenc/jenkins,jpbriend/jenkins,batmat/jenkins,amruthsoft9/Jenkis,amruthsoft9/Jenkis,Vlatombe/jenkins,gitaccountforprashant/gittest,andresrc/jenkins,recena/jenkins,Jochen-A-Fuerbacher/jenkins,Ykus/jenkins,samatdav/jenkins,stephenc/jenkins,amruthsoft9/Jenkis,jglick/jenkins,Ykus/jenkins,evernat/jenkins,olivergondza/jenkins,olivergondza/jenkins,alvarolobato/jenkins,gusreiber/jenkins,alvarolobato/jenkins,ajshastri/jenkins,kohsuke/hudson,viqueen/jenkins,ikedam/jenkins,varmenise/jenkins,fbelzunc/jenkins,bkmeneguello/jenkins,samatdav/jenkins,tfennelly/jenkins,NehemiahMi/jenkins,tangkun75/jenkins,ndeloof/jenkins,gitaccountforprashant/gittest,bkmeneguello/jenkins,protazy/jenkins,vjuranek/jenkins,samatdav/jenkins,FarmGeek4Life/jenkins,damianszczepanik/jenkins,pjanouse/jenkins,rlugojr/jenkins,protazy/jenkins,MichaelPranovich/jenkins_sc,lilyJi/jenkins,gitaccountforprashant/gittest,jpbriend/jenkins,vjuranek/jenkins,jglick/jenkins,v1v/jenkins,rlugojr/jenkins,Ykus/jenkins,jpbriend/jenkins,hplatou/jenkins,rsandell/jenkins,tangkun75/jenkins,jenkinsci/jenkins,sathiya-mit/jenkins,v1v/jenkins,daniel-beck/jenkins,oleg-nenashev/jenkins,SebastienGllmt/jenkins,sathiya-mit/jenkins,patbos/jenkins,ErikVerheul/jenkins,lilyJi/jenkins,FarmGeek4Life/jenkins,FarmGeek4Life/jenkins,MarkEWaite/jenkins,ndeloof/jenkins,Jochen-A-Fuerbacher/jenkins,lilyJi/jenkins,ErikVerheul/jenkins,wuwen5/jenkins,FarmGeek4Life/jenkins,ErikVerheul/jenkins,jenkinsci/jenkins,batmat/jenkins,recena/jenkins,jglick/jenkins,SebastienGllmt/jenkins,escoem/jenkins,azweb76/jenkins,vjuranek/jenkins,Vlatombe/jenkins,rsandell/jenkins,pjanouse/jenkins,evernat/jenkins,jenkinsci/jenkins,csimons/jenkins,kohsuke/hudson,Jochen-A-Fuerbacher/jenkins,dennisjlee/jenkins,aldaris/jenkins,rsandell/jenkins,dariver/jenkins,jglick/jenkins,v1v/jenkins,ndeloof/jenkins,Vlatombe/jenkins,viqueen/jenkins,ndeloof/jenkins,godfath3r/jenkins,tangkun75/jenkins,bpzhang/jenkins,escoem/jenkins,tfennelly/jenkins,protazy/jenkins,Jochen-A-Fuerbacher/jenkins,fbelzunc/jenkins,jenkinsci/jenkins,recena/jenkins,jpbriend/jenkins,hplatou/jenkins,andresrc/jenkins,sathiya-mit/jenkins,damianszczepanik/jenkins,amuniz/jenkins,rsandell/jenkins,ndeloof/jenkins,tfennelly/jenkins,oleg-nenashev/jenkins,hplatou/jenkins,protazy/jenkins,lilyJi/jenkins,kohsuke/hudson,Vlatombe/jenkins,bkmeneguello/jenkins,NehemiahMi/jenkins,viqueen/jenkins,SebastienGllmt/jenkins,ajshastri/jenkins,olivergondza/jenkins,gitaccountforprashant/gittest,ajshastri/jenkins,batmat/jenkins,varmenise/jenkins,oleg-nenashev/jenkins,batmat/jenkins,jpbriend/jenkins,damianszczepanik/jenkins,v1v/jenkins,christ66/jenkins,dariver/jenkins,fbelzunc/jenkins,SebastienGllmt/jenkins,christ66/jenkins,vjuranek/jenkins,ydubreuil/jenkins,jpbriend/jenkins,tfennelly/jenkins,recena/jenkins,NehemiahMi/jenkins,DanielWeber/jenkins,ydubreuil/jenkins,Jimilian/jenkins,ydubreuil/jenkins,ndeloof/jenkins,ajshastri/jenkins,alvarolobato/jenkins,alvarolobato/jenkins,gusreiber/jenkins,viqueen/jenkins,escoem/jenkins,amuniz/jenkins,sathiya-mit/jenkins,fbelzunc/jenkins,aldaris/jenkins,damianszczepanik/jenkins,stephenc/jenkins,andresrc/jenkins,DanielWeber/jenkins,Jimilian/jenkins,kohsuke/hudson,amruthsoft9/Jenkis,NehemiahMi/jenkins,dariver/jenkins,jglick/jenkins,azweb76/jenkins,escoem/jenkins,wuwen5/jenkins,Jimilian/jenkins,FarmGeek4Life/jenkins,dennisjlee/jenkins,tfennelly/jenkins,samatdav/jenkins,jglick/jenkins,patbos/jenkins,patbos/jenkins,kohsuke/hudson,aldaris/jenkins,protazy/jenkins,andresrc/jenkins,rlugojr/jenkins,andresrc/jenkins,jglick/jenkins,ajshastri/jenkins,wuwen5/jenkins,MichaelPranovich/jenkins_sc,alvarolobato/jenkins,FarmGeek4Life/jenkins,lilyJi/jenkins,NehemiahMi/jenkins,christ66/jenkins,hplatou/jenkins,azweb76/jenkins,hplatou/jenkins,wuwen5/jenkins,vjuranek/jenkins,wuwen5/jenkins,olivergondza/jenkins,pjanouse/jenkins,gitaccountforprashant/gittest,Jimilian/jenkins,dennisjlee/jenkins,oleg-nenashev/jenkins,bkmeneguello/jenkins,fbelzunc/jenkins,wuwen5/jenkins,recena/jenkins,jenkinsci/jenkins,andresrc/jenkins,pjanouse/jenkins,sathiya-mit/jenkins,MarkEWaite/jenkins,rsandell/jenkins,v1v/jenkins,lilyJi/jenkins,dennisjlee/jenkins,evernat/jenkins,tangkun75/jenkins,dennisjlee/jenkins,oleg-nenashev/jenkins,rsandell/jenkins,pjanouse/jenkins,tangkun75/jenkins,godfath3r/jenkins,Vlatombe/jenkins,ErikVerheul/jenkins,patbos/jenkins,alvarolobato/jenkins,tfennelly/jenkins,dennisjlee/jenkins,jenkinsci/jenkins,pjanouse/jenkins,aldaris/jenkins,protazy/jenkins,amuniz/jenkins,godfath3r/jenkins,kohsuke/hudson,christ66/jenkins,NehemiahMi/jenkins,FarmGeek4Life/jenkins,csimons/jenkins,escoem/jenkins,amuniz/jenkins,vjuranek/jenkins,MarkEWaite/jenkins,andresrc/jenkins,samatdav/jenkins,ikedam/jenkins,SebastienGllmt/jenkins,Ykus/jenkins,rsandell/jenkins,oleg-nenashev/jenkins,Ykus/jenkins,v1v/jenkins,MarkEWaite/jenkins,stephenc/jenkins,aldaris/jenkins,varmenise/jenkins,dariver/jenkins,amuniz/jenkins,batmat/jenkins,damianszczepanik/jenkins,bkmeneguello/jenkins,daniel-beck/jenkins,csimons/jenkins,dariver/jenkins,ydubreuil/jenkins,aldaris/jenkins,ndeloof/jenkins,azweb76/jenkins,bpzhang/jenkins,daniel-beck/jenkins,csimons/jenkins,Ykus/jenkins,evernat/jenkins,ikedam/jenkins,ajshastri/jenkins,DanielWeber/jenkins,godfath3r/jenkins,SebastienGllmt/jenkins,tangkun75/jenkins,christ66/jenkins,tfennelly/jenkins,bpzhang/jenkins,amuniz/jenkins,dennisjlee/jenkins,gusreiber/jenkins,hplatou/jenkins,varmenise/jenkins,v1v/jenkins,jenkinsci/jenkins,fbelzunc/jenkins,daniel-beck/jenkins,damianszczepanik/jenkins,MichaelPranovich/jenkins_sc,viqueen/jenkins,dariver/jenkins,varmenise/jenkins,daniel-beck/jenkins,DanielWeber/jenkins,stephenc/jenkins,hplatou/jenkins,amruthsoft9/Jenkis,csimons/jenkins,bkmeneguello/jenkins,azweb76/jenkins,ErikVerheul/jenkins,gitaccountforprashant/gittest,samatdav/jenkins,christ66/jenkins,oleg-nenashev/jenkins,MichaelPranovich/jenkins_sc,ydubreuil/jenkins,sathiya-mit/jenkins,MarkEWaite/jenkins,Jimilian/jenkins,ikedam/jenkins,azweb76/jenkins,olivergondza/jenkins,kohsuke/hudson,stephenc/jenkins,ydubreuil/jenkins,viqueen/jenkins,csimons/jenkins,rlugojr/jenkins,recena/jenkins,aldaris/jenkins,olivergondza/jenkins