provision/juju: added cache in elbInstanceHealer
provision/juju: added cache in elbInstanceHealer

Just a premature optmization :-)

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