* refactor(stack): create unique name function
* refactor(stack): change stack resource control id
* feat(stacks): validate stack unique name in endpoint
* feat(stacks): prevent name collision with external stacks
* refactor(stacks): move resource id util
* refactor(stacks): supply resource id util with name and endpoint
* fix(docker): calculate swarm resource id
* feat(stack): prevent migration if stack name already exist
* feat(authorization): use stackutils
Chaim Lev-Ari