Fix for _DTM_ schema, Launchpad 1365202

initialize trafodion, drop will no longer drop dtm log files.
Also, one can no longer create a user table in schema "_DTM_". This
is a reserved schema name for dtm log files.

Change-Id: I50b66303d9aea20e35b9d8fc4c085aff449163d9
Merge "Fix for _DTM_ schema, Launchpad 1365202"