HAWQ-1687. Fix travis broken due to missing apr-1-config
HAWQ-1687. Fix travis broken due to missing apr-1-config

jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq,jianlirong/incubator-hawq