fix local_server.sh script due to rethinkdb v1.11 regression
fix local_server.sh script due to rethinkdb v1.11 regression

Test Plan:
Before this, whenever you kill your local_server.sh, the rethinkdb
process would still be lingering around (and would then proceed to spin up your
CPU in a vain attempt to clean up and die). Verified that now if the
local_server.sh dies from ctrl-c or script error, rethinkdb will be killed by
firing squad if after we politely asked for it to shut down it hasn't complied.

Reviewers: spicyj, xymostech

Reviewed By: spicyj

Differential Revision: http://phabricator.benalpert.com/D124

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