nats-io / nats-server / 4937

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[FIXED] loop detection by checking for duplicate lds subscriptions

This is in addition to checking if the own subscription comes back.
The duplicated lds subscription must come from a different client.
Added unit tests.
Also prefixed lds with '$' to mark it as system subject going forward.

This moves the loop detection check past other checks.
These checks should not trigger in cases where a loop is initially detected.

Fixes #1305

Signed-off-by: Matthias Hanel <mh@synadia.com>

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