POLIO-776 - fix __init__ method for v2metarequest
POLIO-776 - fix __init__ method for v2metarequest

unicef/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,unicef/polio,SeedScientific/polio,unicef/rhizome,unicef/polio,SeedScientific/polio,unicef/polio