JIRA: https://jira.spring.io/browse/INT-3827
Provide a hook to enable removing a file from an `AcceptOnceFileListFilter`,
for example after a message processing failure.
Make the `CompositeFileListFilter` a `ReversibleFileListFilter` so it can
delegate to any of its composed filters that are reversible.
INT-3827: Polishing - PR Comments
(cherry picked from commit 0d721739e9)
Conflicts:
src/reference/asciidoc/ftp.adoc
src/reference/asciidoc/sftp.adoc
don't delete this dir used for testing