Use Async Method for Samsung Prepare

[jaruba]

@tymmesyde not sure how you tested this before, but it seems to work fine for me..

might have found a clean solution for this one by using an optional loaded prop

[unclekingpin]

Looks very good!
To make it safer we could store commandArgs in local variable and check if those are not changed after each async function, literally the same thing as in withStreamingServer.js
cc: @jaruba @tymmesyde