CFY-2110 modified default value of new private_key_file input from null to '' because of an issue in the DSL parser
CFY-2110 modified default value of new private_key_file input from null to '' because of an issue in the DSL parser

GigaSpaces-ProfessionalServices/cloudify-openstack-plugin,codilime/cloudify-openstack-plugin,szpotona/cloudify-openstack-plugin,isaac-s/cloudify-openstack-plugin,geokala/cloudify-openstack-plugin