Fixed to handle Union of datasources and date as column 1

[jyshekhar-git]

Modified code to fix bug to handle union.
original json file had something like:
queryId = query['query']['context']['queryId']
Modified the code to remove this and all instances of ['query']

[jyshekhar-git]

Reason for the change is because the ['query'] in the code was throwing an error of the type:
dataSource = "'" + query['query']['dataSource']['dataSources'][0]['name'] + "|" + query['query']['dataSource']['dataSources'][1]['name'] + "'"
~~~~~^^^^^^^^^
KeyError: 'query'

Also added code for groupBy

[imply-khoondert]

Hi @jyshekhar-git - thanks for the PR - I don't think we want to keep changing the code each time a customer has a different log format... I think it might be better if we make it an option?
This way we use the Imply default way as the default position of the query, but if the query is in a different position we could add a parameter to the command line to say what field the query is