[TC-381] postinstall errors if "secrets" is missing from cdn.conf
[TC-381] postinstall errors if "secrets" is missing from cdn.conf

Also added a question for number of workers

rscrimojr/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,alficles/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,mdb/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,alficles/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,mdb/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,mdb/incubator-trafficcontrol,alficles/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,alficles/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,alficles/incubator-trafficcontrol,alficles/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,mdb/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,alficles/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,mdb/incubator-trafficcontrol,mdb/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,mdb/incubator-trafficcontrol,mdb/incubator-trafficcontrol,alficles/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,mdb/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,jeffmart/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,zhilhuan/incubator-trafficcontrol,naamashoresh/incubator-trafficcontrol,mdb/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,rscrimojr/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,serDrem/incubator-trafficcontrol,alficles/incubator-trafficcontrol,alficles/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol