:param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
:param all_tenants: True if not filtering by tenant. Only allowed for admin
:param filter_by: dictionary with filtering
:param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
:param all_tenants: True if not filtering by tenant. Only allowed for admin
:param filter_by: dictionary with filtering