lib/scsi: downgrade SCSI SO version

Internal headers (such as one in SCSI) should not trigger the
SO versoning fialures. This was addressed by patch:

(f53bf767)test/check_so_deps: limit scope of header checks.

Additionally quite recently another patch increased the SO version
for SCSI:
(6b6a3ff9)scsi: add SPC2 RESERVE/RELEASE support

They were not in the same relation chain when being submitted,
so they didn't test against each other.

This resulted in:
SO name for libspdk_scsi.so changed without a change to abi. please revert that change.

For this reason this patch revs down the SO version for SCSI lib.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Change-Id: I69caae6c139e546afe2eeeae3395dc80ff898339
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3114


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>