Improve lsm_scsi_vpd83_of_disk_path().
Improve lsm_scsi_vpd83_of_disk_path().

 * Split functions out in order to share code with other functions:
    * _parse_vpd_83()               -- Extract designation descriptor out.
    * _sysfs_vpd_pg83_data_get()    -- Get VPD83 data via sysfs.

 * Only check the VPD83 of LUN by matching ASSOCIATION field as 0x00.

 * Rename internal constants to this format:
            _T10_<standard_name>_<type>_<page_code>_XXX
    Exampel: _T10_SPC_VPD_DI_MAX_LEN

Signed-off-by: Gris Ge <e24f3acbe39bf94f92e8af3c48f8852106ad5ad7@redhat.com>

tasleson/libstoragemgmt,libstorage/libstoragemgmt,joehandzik/libstoragemgmt,libstorage/libstoragemgmt,tasleson/libstoragemgmt,joehandzik/libstoragemgmt,tasleson/libstoragemgmt,joehandzik/libstoragemgmt,cathay4t/libstoragemgmt,jumitche/libstoragemgmt,jumitche/libstoragemgmt,libstorage/libstoragemgmt,jumitche/libstoragemgmt,cathay4t/libstoragemgmt,cathay4t/libstoragemgmt,libstorage/libstoragemgmt,tasleson/libstoragemgmt,joehandzik/libstoragemgmt,libstorage/libstoragemgmt,cathay4t/libstoragemgmt,tasleson/libstoragemgmt,jumitche/libstoragemgmt,cathay4t/libstoragemgmt,jumitche/libstoragemgmt