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Description of problem:

When MegaRAID is configured as cached I/O, the write cache type should be
always write back regardless the write cache setting, while libstoragemgmt
still check write cache settings.

Upstream fix is: https://github.com/libstorage/libstoragemgmt/pull/322

Version-Release number of selected component (if applicable):
libstoragemgmt-1.6.1-1.el7

How reproducible:
100%

Steps to Reproduce:
1. Install storcli from vendor
2. sudo storcli /c0/v0 set iopolicy=Cached
3. sudo storcli /c0/v0 set wrcache=WB
4. sudo lsmcli -u megaraid:// vci --vol <volume_id>

Actual results:
The write cache policy is "auto"

Expected results:
The write cache policy is "write back"

Additional info:

# lsmcli --version
/usr/bin/lsmcli 1.4.0
# lsmcli -u megaraid:// vci --vol 600605b002884430211487073c80afec
Volume ID                        | Write Cache Policy | Write Cache   | Read Cache Policy | Read Cache | Physical Disk Cache
----------------------------------------------------------------------------------------------------------------------------
600605b002884430211487073c80afec | Write Through      | Write Through | Disabled          | Disabled   | Disabled


# lsmcli --version
/usr/bin/lsmcli 1.6.1
# lsmcli -u megaraid:// vci --vol 600605b002884430211487073c80afec
Volume ID                        | Write Cache Policy | Write Cache | Read Cache Policy | Read Cache | Physical Disk Cache
--------------------------------------------------------------------------------------------------------------------------
600605b002884430211487073c80afec | Write Back         | Write Back  | Enabled           | Enabled    | Disabled

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0864