CFY-6005. Fix use callback invocation (#458)
CFY-6005. Fix use callback invocation (#458)

Invoke `use` callback function directly instead of the click command
that will try to parse arguments.
mahak/cloudify-cli,isaac-s/cloudify-cli,cloudify-cosmo/cloudify-cli,mahak/cloudify-cli,isaac-s/cloudify-cli,cloudify-cosmo/cloudify-cli,mahak/cloudify-cli,isaac-s/cloudify-cli,isaac-s/cloudify-cli,mahak/cloudify-cli