getTablePrivileges() does not report TRUNCATE privilege correctly

Hi,

I was seeing an UNKNOWN privilege returned from getTablePrivileges() and the cause for this is the new TRUNCATE
privilege. 

I have a table where the acl looks like this:

{thomas=arwdDxt/thomas,=arwdDxt/thomas}

The D will be translated to "UNKNOWN" in AbstractJdbc2DatabaseMetaData.addACLPrivileges()

The switch simply does not contain an entry for 'D', so the fix should be fairly easy.

I checked this in the sources for 8.4-701


Regards
Thomas