OpTestUtils: Handle successful login response format difference

Depending on code level running on BMC/eBMC, expected format
for a response on successful login operation may differ.

Expected: status': 'ok'
Actual: "token":"<token>"

This patch adds code to handle this valid response.

before FIx:

Traceback (most recent call last):
  File "/home/shirisha_g/Desktop/Reinstall-202132021432/OPTEST-SETUP/op-test/common/OpTestUtil.py", line 2576, in login
    .format(r.status_code, json_data['status'],
KeyError: 'status'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/shirisha_g/Desktop/Reinstall-202132021432/OPTEST-SETUP/op-test/OpTestConfiguration.py", line 939, in objs
    password=self.args.bmc_password)
  File "/home/shirisha_g/Desktop/Reinstall-202132021432/OPTEST-SETUP/op-test/common/OpTestEBMC.py", line 55, in __init__
    r = self.conf.util_bmc_server.login()
  File "/home/shirisha_g/Desktop/Reinstall-202132021432/OPTEST-SETUP/op-test/common/OpTestUtil.py", line 2599, in login
    .format(self._url(uri), username, password, e))
common.Exceptions.HTTPCheck: Something happened with the HTTP Server.  Review the following for more details
Message="Requests post problem, check that your credentials are properly

Signed-off-by: Praveen K Pandey <praveen@linux.vnet.ibm.com>

common/OpTestUtil.py

@@ -2571,6 +2571,12 @@ def login(self, username=None, password=None):
                 self.xAuthHeader['X-Auth-Token'] = match.group(1)
                 self.jsonHeader.update(self.xAuthHeader)
             json_data = json.loads(r.text)
+            if json_data.get('token'):
+                json_data={
+                          "data": "User '%s' logged in" %username,
+                            "message": "200 OK",
+                              "status": "ok"
+                              }
             log.debug("r.status_code={} json_data['status']={}"
                       " r.text={} r.headers={} r.request.headers={}"
                       .format(r.status_code, json_data['status'],