CLOUDIFY-2012 deleted python_webserver_installer from local dir and fix stup plugin according to new structure
CLOUDIFY-2012 use github repo for webserver plugin url
CLOUDIFY-2012 fix plugin url according to new dir name
CLOUDIFY-2012 update pip upon worker installation and changed log to info level
CLOUDIFY-2012 use pip to install plugins
CLOUDIFY-2012 launch agent worker with debug log level
CLOUDIFY-2012 upgrade pip in management machine
CLOUDIFY-2012 changed plugins strcture according to new installation process