Remove onion service v2 support

onionbalance/common/argparser.py

onionbalance/config_generator/config_generator.py

onionbalance/hs_v2/__init__.py

onionbalance/hs_v2/config.py

onionbalance/hs_v2/consensus.py

onionbalance/hs_v2/descriptor.py

onionbalance/hs_v2/eventhandler.py

onionbalance/hs_v2/instance.py

onionbalance/hs_v2/manager.py

onionbalance/hs_v2/service.py

onionbalance/hs_v2/settings.py

onionbalance/hs_v2/status.py

onionbalance/hs_v2/util.py

onionbalance/hs_v3/onionbalance.py

onionbalance/manager.py

test/functional/util.py

test/functional/v2/__init__.py

test/functional/v2/test_onionbalance_config.py

test/functional/v2/test_publish_master_descriptor.py

test/functional/v3/test_onionbalance_config.py