the parallelism and parallelism-chunk-size flags
which used to control how many parts to split a
segment into and many to perform in parallel
are now deprecated and replaced by
maximum-concurrent-pieces and long-tail-margin.
now, for an individual transfer, the total number
of piece uploads that transfer will perform is
controlled by maximum-concurrent-pieces, and
segments within that transfer will automatically
be performed in parallel. so if you used to set
your parallelism to n, a good value for the pieces
might be something approximately like 130*n, and
the parallelism-chunk-size is unnecessary.
Change-Id: Ibe724ca70b07eba89dad551eb612a1db988b18b9
54ef1c8ca2