This fixes 'test_tools_smoke' from failing on systems
running linux < 4.6 because of the wakeuptime script.
This script uses the bpf stack maps feature which is
available only for linux 4.6+. To avoid this, we skip
running it if the minimum kernel version requirement
is not met.

Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>