Migrate tests to 3.0 and 4.0 protocol_type

[Patrik-Stas]

• Reads environment variable DISALLOW_V1 . If set to true, code will panic on attempt to create v1 connection or to use onboarding v1
• Defaults to protocol V3
• Read environment variable CONFIG_PROTOCOL_TYPE - to override protocol type (useful when working on migration of
  a test from v1 to aries)
• When running in test mode, connect_register_provision prints libvcx settings.
• Uses agency_pool_tests feature to separate tests which require both pool and agency.

Contains PR #66

• removes support for update_agent_info - this was setting COM_METHOD on agency, we don't use this. We are using update_webhook_url
• removes support for download_agent_messages - is different from download_messages. The download_agent_messages was trying to download sent messages from agency - this was valid use case only on v1 agency, not with aries anymore.
  also delete redirection test to reduce noise, we won't be supporting that, it's also legacy
• turned test test_update_agent_info_real into test_update_agent_webhook_real and activated it. I know we should maybe fetch the value from agency and compare it, but let's leave that for next phase. Let's just do necessary to get those tests passing now.
• remove test test_download_agent_messages - was testing download_agent_messages feature which only applies to V1 agency.
• the removed test was replaced by test_send_and_download_messages which tests downloading received messages.

[Patrik-Stas]

This is used only be tests agency_pool_tests tests. Those tests are still not passing due to some issues, however this is their shared step and changes in this PR fixes run of create_connected_connections. Previously this method assumed legacy connections