LU-14583 llapi: handle symlinks in llapi_file_get_stripe()

LU-14583 llapi: handle symlinks in llapi_file_get_stripe()

In llapi_file_get_stripe(), if the IOC_MDC_GETFILESTRIPE ioctl handler
returns -ENOTTY or -ENODATA then try to resolve any symlinks in the
path and try again.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: Ic046d6ef77d8342d47336144e3066cab3a940a96
Reviewed-on: https://review.whamcloud.com/43229
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>