Updating IxL_RestApi.py file

[karmoham]

Proposed changes in the following Pull request

• Fixed def pollStats method (Logs attached)

    restObj.deleteAllSessions()

    statsDict = {
        'restStatViews': ['stateless Peer - Total Packets',
                                 'stateless Peer - Packet Rates',
                                 'stateless Peer - Active Streams']
                }

    restObj.pollStats(statsDict,csvFile=True, exitAfterPollingIteration=15)

SuccessfullPoll_log.txt
UnSuccessfullPoll_log.txt

• Added def logWarning method to the module
• Added def deleteAllSessions method to wipe out all the previously created ones