Attempt to fix occasionally failing test in TravisCI
Attempt to fix occasionally failing test in TravisCI

Failure is:
   Failed test 'Duplicate key (certificate)'
   at ./18_workflow_csr_key_reuse.t line 173.
          got: 'KEY_DUPLICATE_ERROR_WORKFLOW'
     expected: 'KEY_DUPLICATE_ERROR_CERTIFICATE'

My guess: the server side workflow engine has not yet persisted
certificate related data before the client accesses it again.

oliwel/openxpki,oliwel/openxpki,openxpki/openxpki,openxpki/openxpki,stefanomarty/openxpki,oliwel/openxpki,openxpki/openxpki,stefanomarty/openxpki,oliwel/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,oliwel/openxpki,oliwel/openxpki,stefanomarty/openxpki,stefanomarty/openxpki,openxpki/openxpki