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This reverts commit e2c9fee8ed846aba124a2fc1bba245790ed7ba90. We have decided that we don't want to support the json-style argument as described by bug#1374118 (see thread at [1]). This restores the old behavior of sending the argument in double-quotes so environment variables get expanded. As a bonus, tests for this are added. [1] http://lists.openstack.org/pipermail/openstack-dev/2014-October/049341.html Change-Id: I9fc99f3716cc53366907878adb00ae6cf3898f14 Closes-Bug:#1386413