Adding a hits to notice operator when trace not found

A wrong HMAC key provided in original calling will make osprofiler
refuses to collect tracing data. This change updated hits output of
command "trace show" when specified trace not found, to make operator
awares this case.

Change-Id: Ie9dbeb3d89c41cdba8a7f695c3460218204d5dbf
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>