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ARROW-3199: [Plasma] File descriptor send and receive retries

An additional piece of eyes would be appreciated for this. It seems to solve our issue reported in the JIRA, but I'm not sure what the semantics of partial reads/writes is here (in particular, how are partial read/writes handled for ancillary data like file descriptors?).

found by cc @stephanie-wang

Author: Philipp Moritz <pcmoritz@gmail.com>

Closes #2551 from pcmoritz/plasma-retries and squashes the following commits:

c7ca3b700 <Philipp Moritz> fix
91061adc5 <Philipp Moritz> linting
fda4dd27d <Philipp Moritz> move retry code
5dbabd79a <Philipp Moritz> fix travis
bc876dc29 <Philipp Moritz> fix compile errors
e1580fe81 <Philipp Moritz> plasma file descriptor send and receive retries