run_remote_tests: add quote marks around argument passing
run_remote_tests: add quote marks around argument passing

* stops the second-pass parsing of arguments into IFS-delimited elements
which unbreaks things like --args='-n 10'

Change-Id: If8424b5fc06e6dd5a935421a76539e7e91006c37

BUG=
TEST=run it and see the argument being passed correctly

Review URL: http://codereview.chromium.org/3422005

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