New method for new device discovery

[27149chen]

The main Connect method is too heavy, too many calls are introduced. usually when a device is created and mapped, we only need to rescan the session and wait till the disk appears.

So what about adding a new method for new device discovery that only run a rescan and return when the device is ready? Assume that we already know the TransportName and sessions are existing. It will have a better performance especially for large number of devices at a time.

[27149chen]

@j-griffith @saad-ali @childsb what do you think?

[zhucan]

@27149chen I think that we can rescan first, if there is no sessions existing, we can login.

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