LU-13826 utils: fix compatibility for LL_IOC_MDC_GETINFO

LU-13826 utils: fix compatibility for LL_IOC_MDC_GETINFO

The landed patch "LU-11367 som: integrate LSOM with lfs find"
uses "LL_IOC_MDC_GETINFO_OLD", so while the IOCTL number/structs
are ABI compatible, it is not API compatible and applications
using for the header including the definition LL_IOC_MDC_GETINFO
is broken.

This patch defines versioned IOCTL number: LL_IOC_MDC_GETINFO_V1,
LL_IOC_MDC_GETINFO_V2. Then we can use the explicitly verioned
constrants everywhere for the in-tree code, and declare
LL_IOC_MDC_GETINFO in a compatible way, but external applications
can select the version that they want explicitly.

And this patch does the same fix for IOC_MDC_GETFILEINFO.

Fixes: 11aa7f8704c4 ("LU-11367 som: integrate LSOM with lfs find")
Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: I39e0273c4a7331ec782de3e8686b8a756e56beec
Reviewed-on: https://review.whamcloud.com/40858
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>