oeqa/sshcontrol: Handle empty reads

Looking at some of the autobuilder failures, it seems that somehow empty
reads might be possible despite not being EOF. Tweak the code to be a little
more robust in handling this.

In theory this shouldn't be possible but python does handle signals a bit
differently (e.g. transparrently retrying syscalls for EINTR) so adding this
check and a bit of code safety at least rules out this problem.

(From OE-Core rev: 9d91a5674c515a43ae76d8615f72e5e2dc16c961)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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