(fix) Fix instanciation of mainnet network instance to not support k8s anymore (that node has been removed in favor of the load balanced nodes)

Author: abel

Pipfile.lock

@@ -109,7 +109,6 @@ def testnet(cls):
     @classmethod
     def mainnet(cls, node='lb'):
         nodes = [
-            'k8s', # us, prod
             'lb', # us, asia, prod
             'sentry0',  # ca, prod
             'sentry1',  # ca, prod