Bug 29274: Remove z_reset.t

Bug 29274: Remove z_reset.t

From the description of commit d25f3e84374ec8d7c85f8ed805102f67c0a73d77

"""
    Bug 22709: (RM follow-up) Clean up plugin tests

    The plugin tests were failing due to failed rollbacks and run order.
    This patch moves them into their own directory and adds a reset test to
    restore the original state of the plugin system after the tests have
    run.
"""

This is wrong, the tests are run in a random order.

We don't need this file.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>