Enabling a previously disabled session might lead to message loss

[chrjohn]

Describe the bug When a session is disabled (i.e. after calling logout()) it will no longer get reset as defined by its SessionSchedule. This is because next() returns early when a session is disabled:

https://github.com/quickfix-j/quickfixj/blob/f8ba074829c5e362e5caf1820804be878d02b63d/quickfixj-core/src/main/java/quickfix/Session.java#L1952-L1963

To Reproduce

Will try to create a unit test in due course.

Manual steps:

• have a session that is disabled and has not been used at the current day (i.e. there was no established session for that day)
• send messages to that Session via sendToTarget() - the messages will end up in the Session's message store.
• establish a connection to the session
• based on QFJ's internal timer, the next() method will be called within a second and a reset will be done, effectively removing the Sessions's message store

Expected behavior

Session should get reset based on its schedule even when it is disabled.