Moved 'Delete Error logs' to utils.robot for general use.

- Moved 'Delete Error logs' from test_error_log.robot to utils.robot
  to allow for general use.

Change-Id: I4ec691aa1164e513ddf5686a54381bea288a32ad
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
2 files changed