provision/docker: fix amount of units in deploy call
provision/docker: fix amount of units in deploy call

We should use the sum of units in every process, and not the amount of
processes.

Related to #647 and #1136.

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