Add a space to the output of the method log_error

Before this change:

 - ./tuskar/tools/config/check_uptodate.sh: L23

After this change:

 - ./tuskar/tools/config/check_uptodate.sh : L23

Benefit: I can double click the filename in my terminal and then the
         filename will be copied into the clipboard without the
         leading ':'.

Change-Id: I6a2ef2105d3779118328fb36bd11b435812c406d