function ov transport connect
It uses the $TRANPORT variable to select the correct method to use to connect.
In the case of the serial transport, this function makes sure the board is logged in and sitting at a shell prompt.
As with other "ov_" functions, it can be overridden in the board file for a board, to customize any operations required for connecting to a board.
This could be used for a number of things, including:
- powering on a board
- establishing a VPN connection to a remote lab
- reserving a board using an external management system
- $TRANSPORT - specifies the type of transport used to communicate with the board. This should be one of "ssh", "serial", "ttc".