Issue #134: Octane report plugin support

[satwic007]

Description: This PR adds Octane plugin code. We just need to add the config to the plaxrun file and plaxrun takes care of the rest.

Sample usage:

1. I added config (referred in the doc/octane_plugin.md below) to cmd/plaxrun/demos/waitrun.yaml and ran the command - plaxrun -run cmd/plaxrun/demos/waitrun.yaml -dir demos -g wait-no-prompt -json
2. Octane plugin - console log:

   <test_result>
   <product_areas>
   <product_area_ref id="123456"></product_area_ref>
   </product_areas>
   <test_runs>
   <test_run name="test-wait waitrun-0.0.1:wait-no-prompt:wait" duration="606" status="Failed" started="1632173133000">
   <test_fields>
   <test_field type="Framework" value="plax"></test_field>
   </test_fields>
   <error>Broken: Err: Broken: phase phase1: Broken: step 5: Broken: Javascript problem: failure: too slow: 605</error>
   </test_run>
   </test_runs>
   </test_result>

3. Equivalent Plax console log:

   {
   "name": "waitrun",
   "version": "0.0.1",
   "testsuite": [
   {
     "name": "waitrun-0.0.1:wait-no-prompt:wait",
     "tests": 1,
     "passed": 0,
     "skipped": 0,
     "failures": 0,
     "errors": 1,
     "testcase": [
       {
         "name": "test-wait",
         "file": "/Users/smudig200/Documents/comcastgit/octane_plugin/plax/demos/test-wait.yaml",
         "status": "error",
         "time": 606178000,
         "started": "2021-09-20T21:25:33.730331Z",
         "message": "Broken: Err: Broken: phase phase1: Broken: step 5: Broken: Javascript problem: failure: too slow: 605"
       }
     ],
     "timestamp": "2021-09-20T21:25:33.728889Z",
     "time": 607622000
   }
   ],
   "tests": 1,
   "passed": 0,
   "skipped": 0,
   "failures": 0,
   "errors": 1,
   "timestamp": "2021-09-20T21:25:33.728736Z",
   "time": 607783000
   }