provision/docker: images without process data using number of containers
provision/docker: images without process data using number of containers

When deploying legacy applications still using unit agent this is
useful.

Related to #647 and #1136.

ggarnier/tsuru,ArxdSilva/tsuru,guilhermebr/tsuru,firebitsbr/tsuru,tsuru/tsuru,cezarsa/tsuru,cezarsa/tsuru,tsuru/tsuru,hcxiong/tsuru,RichardKnop/tsuru,cgvarela/tsuru,gciotta/tsuru,4eek/tsuru,tuxmonteiro/tsuru,hcxiong/tsuru,gwmoura/tsuru,cgvarela/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,firebitsbr/tsuru,gwmoura/tsuru,firebitsbr/tsuru,mderaldo/tsuru,4eek/tsuru,Endika/tsuru,ArxdSilva/tsuru,Endika/tsuru,RichardKnop/tsuru,hcxiong/tsuru,jblancett/tsuru,tuxmonteiro/tsuru,jblancett/tsuru,jblancett/tsuru,cgvarela/tsuru,mderaldo/tsuru,gciotta/tsuru,4eek/tsuru,guilhermebr/tsuru,guilhermebr/tsuru,kgrvamsi/tsuru,guilhermebr/tsuru,gwmoura/tsuru,gciotta/tsuru,RichardKnop/tsuru,mderaldo/tsuru,tsuru/tsuru,tuxmonteiro/tsuru,Endika/tsuru,ggarnier/tsuru,ggarnier/tsuru,kgrvamsi/tsuru,tsuru/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,kgrvamsi/tsuru