Demote warning on use of latest DB tags

Currently, when CondDB.LatestGlobalTagByDataType(s) is set in options, the following warning is emitted unconditionally:

 # WARNING: Default global tags will be overridden with the latest ones available for 'Upgrade' data type: {'DDDB': 'upgrade/dddb-20200529', 'SIMCOND': 'upgrade/sim-20200515-vc-md100'}

Here, this is demoted to INFO since the message is the result of explicitly using an option (so the user shouldn't need to be warned).

This issue exposed by Rec!2141 (merged)

Det/DetCond/python/DetCond/Configuration.py

@@ -197,7 +197,7 @@ class CondDB(ConfigurableUser):
             if self.getProp("Tags"):
                 self.Tags = {}
             self._useLatestTags(datatype)
-            log.warning(
+            log.info(
                 "Default global tags will be overridden with the latest ones"
                 " available for '%s' data type: %s" % (datatype,
                                                        self.getProp("Tags")))