print_separator needs to be run as a subshell, because we need its output, not
the string itself. This fixes a print display bug where we show
"print_separator" instead of the actual separator.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>