Cleanup pvs, vgs, and lvs "-o" section in man pages (rhbz 500861).

Cleanup pvs, vgs, and lvs "-o" section in man pages (rhbz 500861).

http://bugzilla.redhat.com/show_bug.cgi?id=500861
- Update list of fields/columns for each command (a few missing).
- Update list order to match "-o help" output (easier to verify field list)
- Add "{pv|vg|lv}_all" description.
- Move "-o help" sentence above column/field list.

New sample man page for lvs (pvs and vgs are similar):
       -o, --options
              Comma-separated ordered list of columns.  Precede the list  with  ’+’  to  append  to  the
              default selection of columns instead of replacing it.

              Use  -o  lv_all to select all logical volume columns, and -o seg_all to select all logical
              segment columns.

              Use -o help to view the full list of columns available.

              Column names  include:  lv_uuid,  lv_name,  lv_attr,  lv_major,  lv_minor,  lv_read_ahead,
              lv_kernel_major,  lv_kernel_minor,  lv_kernel_read_ahead, lv_size, seg_count, origin, ori-
              gin_size, snap_percent, copy_percent, move_pv, convert_lv, lv_tags,  mirror_log,  modules,
              segtype,  stripes,  stripesize,  regionsize, chunksize, seg_start, seg_start_pe, seg_size,
              seg_tags, seg_pe_ranges, devices.

              With --segments, any "seg_" prefixes  are  optional;  otherwise  any  "lv_"  prefixes  are
              optional.  Columns mentioned in vgs (8) can also be chosen.

              The lv_attr bits are: