EC2 Agents do not support virtual hosts after downloading classpath zip

It seems that the AgentContext (responsible for creation of HttpClient) created via reflection during bootstrap process does not inject the Host parameter correctly. Fingerprints/main classpath is loaded OK, but the bundled plugins aren't.
This is a regression introduced when we added Agent v2 support.
Workarounds:

• route all calls with Host header set to 127.0.0.1 directly to Bamboo's virtual host. The workaround cannot be used if the HTTP server fronts more than one Bamboo server.
• Set the BaseURL directly to non-fronted address. This does not mean that the non-fronted address has to be used for WWW access or exposed to Internet. I haven't tested this, but it will probably work.