backend/swift: Authentication updates
backend/swift: Authentication updates

Support for cross-domain authentication has been added and mapping
environment variables to the correct domain settings has been
fixed.

In addition, support for clouds.yaml files has been added.
heimweh/terraform,gechr/terraform,apparentlymart/terraform,brandontosch/terraform,pdecat/terraform,apparentlymart/terraform,heimweh/terraform,luis-silva/terraform,nlamirault/terraform,ewbankkit/terraform,pdecat/terraform,luis-silva/terraform,brandontosch/terraform,apparentlymart/terraform,gechr/terraform,luis-silva/terraform,VladRassokhin/terraform,VladRassokhin/terraform,nlamirault/terraform,VladRassokhin/terraform,tommynsong/terraform,tommynsong/terraform,gechr/terraform,brandontosch/terraform,hashicorp/terraform,heimweh/terraform,nlamirault/terraform,pryorda/terraform,pryorda/terraform,pdecat/terraform,rnaveiras/terraform,hashicorp/terraform,heimweh/terraform,apparentlymart/terraform,pryorda/terraform,heimweh/terraform,ewbankkit/terraform,pdecat/terraform,pradeepbhadani/terraform,ewbankkit/terraform,brandontosch/terraform,apparentlymart/terraform,brandontosch/terraform,rnaveiras/terraform,ewbankkit/terraform,tommynsong/terraform,pradeepbhadani/terraform,luis-silva/terraform,hashicorp/terraform,rnaveiras/terraform,VladRassokhin/terraform,pradeepbhadani/terraform