   Bug 1164779 - [MCTS] cert and security test report is not generated
   Bug 1164779 - [MCTS] cert and security test report is not generated

   1. change load config to replace '/' to os.sep in loop
   2. only add --host and --port to webapi test in 'stingray' mode

mozilla-b2g/fxos-certsuite,ypwalter/fxos-certsuite,Conjuror/fxos-certsuite,Conjuror/fxos-certsuite,oouyang/fxos-certsuite,oouyang/fxos-certsuite,ShakoHo/fxos-certsuite,Conjuror/fxos-certsuite,ShakoHo/fxos-certsuite,ypwalter/fxos-certsuite,Conjuror/fxos-certsuite,mozilla-b2g/fxos-certsuite,ypwalter/fxos-certsuite,askeing/fxos-certsuite,askeing/fxos-certsuite,ShakoHo/fxos-certsuite,mozilla-b2g/fxos-certsuite,ShakoHo/fxos-certsuite,mozilla-b2g/fxos-certsuite,ShakoHo/fxos-certsuite,ypwalter/fxos-certsuite,Conjuror/fxos-certsuite,ypwalter/fxos-certsuite,mozilla-b2g/fxos-certsuite,mozilla-b2g/fxos-certsuite,ypwalter/fxos-certsuite,askeing/fxos-certsuite,oouyang/fxos-certsuite,ShakoHo/fxos-certsuite,Conjuror/fxos-certsuite,askeing/fxos-certsuite,ypwalter/fxos-certsuite,mozilla-b2g/fxos-certsuite,ShakoHo/fxos-certsuite,Conjuror/fxos-certsuite,oouyang/fxos-certsuite,oouyang/fxos-certsuite,oouyang/fxos-certsuite,askeing/fxos-certsuite,askeing/fxos-certsuite,askeing/fxos-certsuite,oouyang/fxos-certsuite