Changes in 'make dev-env'
    1. if "make dev-env" is issued then it does build for current directory
    (contrail-web-core)
    2. If want to build for other features, then we can specify like
       "make dev-env REPO=webController,storage
    The options for REPO MUST be already available under config.featurePkg.
    3. Making a soft link of node_modules to all package directory.