CFY-418 added log message when worker is already installed
CFY-418 added log message when worker is already installed

isaac-s/cloudify-manager,konradxyz/dev_fileserver,konradxyz/cloudify-manager,cloudify-cosmo/cloudify-manager,cloudify-cosmo/cloudify-manager,codilime/cloudify-manager,konradxyz/dev_fileserver,konradxyz/cloudify-manager,codilime/cloudify-manager,geokala/cloudify-manager,isaac-s/cloudify-manager,codilime/cloudify-manager,geokala/cloudify-manager,isaac-s/cloudify-manager,cloudify-cosmo/cloudify-manager