For efficiency, rtslib may have caches (today for the data
in configfs). A client may need to clear out these caches
such as via the refresh option in targetcli.
* Add new invalidate_caches method to RTSRoot. While this only
has a single cache today, it gives the ability to extend to
any future caches.
* While bs_cache really should be private, it probably
shouldn't be changed given that this is a library and may be
used elsewhere.
Signed-off-by: Amartey Pearson <apearson@us.ibm.com>
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