util: disable walkrepo() recursive behaviour
Revert
b1aea76f700 and
268c582bd42a for performances reasons. Traversing
checkout working directories may be too expensive.
Fix Bugzilla integration to work with new Bugzilla 3.2.
Bugzilla 3.2 changes the type of all MySQL tables it uses from MyISAM
to InnoDB. MyISAM does not support transactions, and performs an implied
commit after each update. InnoDB does support transactions, and so
exposes a bug where changes to the Bugzilla database were not committed,
and so with 3.2 are lost when the database connection closes.