blkid: add long options

blkid: add long options

This change attempts to make tab completion more reasonable by alloging
memorizable option names.  That also has positive impact to manual page, in
which referrals to other options are now easier to understand.

All short options are kept exactly as they were to avoid ABI breakage.  The
only exception is -f option that getopt(3) recognized, but was not found
from anywhere else.  The -f has been part of blkid since the initial commit.

Commit: 51410fc6deb29cae54a2669aafabae6c49f964fc
Signed-off-by: Sami Kerola <kerolasa@iki.fi>