allow 'small' and also new 'single' values for PLAT_NETWORK environment variable to faciliate testing with smaller platform networks based on the simulated one
allow 'small' and also new 'single' values for PLAT_NETWORK environment variable to faciliate testing with smaller platform networks based on the simulated one

ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services,ooici/coi-services