bitbake: bitbake-worker: Further IO performance tweaks

Looking further at the CPU loads on systems running large numbers of tasks,
the following things helps performance:

* Loop on waitpid until there are no processes still waiting
* Using select to wait for the cooker pipe to be writable before writing
  avoiding pointless 100% cpu usage
* Only reading from worker pipes that select highlights are readable

(Bitbake rev: 9375349e27b08b4d1cfe4825c042d4c82120e00b)

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

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