Restore printing of values in omshell to the style pre 21518. For

Restore printing of values in omshell to the style pre 21518.  For
21518 we changed the print routines to always display time values
as a hex list.  This had a side effect of printing all data strings
as a hex list.  We shall investigate other ways of displaying time
values more usefully.  [ISC-Bugs #22626]