Adding default.config.global.js in config.
In case user deletes some config from /etc/contrail/config.global.js
mistakenly or during upgrade as config file does not get replaced, this is used
to copy the config from default config to actual config file.
Changing all the tab chars to space in web/jobServerStart.js
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.