Make sending new line in ExpectShellSession optional
In some cases (like changing password) sending new line in the beginning of the shell session is not desired. The solution for it is making this line optional: https://git.lavasoftware.org/lava/lava/blob/master/lava_dispatcher/shell.py#L339. I guess it can be set in job context or test shell context, whichever is easier.
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