app: added KeystoneEnv field in app
app: added KeystoneEnv field in app

This field is a KeystoneEnv type and stores the tenant id,
user id and access key. These fields are needed to perform
other operations with keystone client, since we don't need
the others, we do not store them.

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