Invoked when creating a new client session in order to allow for overriding of the original parameters
Parameters:
host - The requested host - never null/empty
port - The requested port
localAddress - Optional binding endpoint for the local peer
username - The requested username
proxyJump - The requested proxyJump
context - An optional "context" provided during the connection request (to be attached to
the established session if successfully connected)
Returns:
A HostConfigEntry for the actual target - null if use original parameters.
Note: if any identity files are attached to the configuration then they must point to
existing locations. This means that any macros such as ~, %d, %h, etc.
must be resolved prior to returning the value
Throws:
IOException - If failed to resolve the configuration