Refactoring - Githubissues

Renaming BusyConnectionsStrategy to BusyActivitiesStrategy for more general usage, e.g. load balancing based on number of ongoing requests in http2
OriginsInventory is now an abstract class. StyxOriginsInventory has become the default implementation of OriginsInventory.
Allow passing in SslContextBuilder for getting/creating SslContext in SslContextFactory
Fixed E2E tests broken by TLSv1 and TLSv1.1 being switched off by default in OpenJDK

ExpediaGroup / styx