service: added test for insert service instance params.
service: added test for insert service instance params.

related to #601.

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