Rewrite hotplug_007_pos as zpool_replace_002_neg

tests/sys/cddl/zfs/tests/cli_root/zpool_replace/Makefile
tests/sys/cddl/zfs/tests/cli_root/zpool_replace/zpool_replace_002_neg.ksh
tests/sys/cddl/zfs/tests/cli_root/zpool_replace/zpool_replace_test.sh
tests/sys/cddl/zfs/tests/hotplug/Makefile
tests/sys/cddl/zfs/tests/hotplug/hotplug_007_pos.ksh
tests/sys/cddl/zfs/tests/hotplug/hotplug_test.sh
Rewrite hotplug_007_pos.ksh as zpool_replace_002_neg.ksh. It
doesn't really have anything to do with hotplugging. The new test
is simpler and runs faster, too.

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