Added logging path for historian migration utility.
Added logging path for historian migration utility.

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS11]$/openHistorian/Main;C41037

GridProtectionAlliance/openHistorian,GridProtectionAlliance/openHistorian,GridProtectionAlliance/openHistorian,GridProtectionAlliance/openHistorian,GridProtectionAlliance/openHistorian,GridProtectionAlliance/openHistorian