[devtools] even better: use a plain Connection (server-side) object for pre_setup
The previous commit switched from passing a Session to a
ClientConnection.
This fixes unittest_ldapsource's pre_setup_database, which relied on a
server-side object to get at the repo.
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
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additional-builtins = _, display_name
[BASIC]
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[TYPECHECK]
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