eve-log prefix field feature broken
The eve-log prefix field is ignored. This was added as a feature in this release, but was undone by a later PR.
Bug 1204 (https://redmine.openinfosecfoundation.org/issues/1454) added the prefix field and was fixed in PR 1532 (Merged through PR 1540)
In this commit, the prefix logic is not moved to the the newly created function: util-logopenfile.c:LogFileWrite
(Merged through 1712)