Description of problem:

The username is not fully displayed in "last" output
Only the first 8 characters are shown. Given the man page
does notmention this limitation, and given further
the user name is not limited to 8 characters on RHEL
(adduser allows longer usernames, redhat-config-user
does, UT_NAMESIZE is 32), this hard limit is
insufficient, especially if you have a username
that is 8 chars long and a second user with a name
that is longer, but has the same first 8 chars.

The same applies to "w" in the procps and "who"
in the coreutils packages.

utmp and wtmp do have proper data, 
Other utils (ls, utmpdump) handle long file names
correctly.

Version-Release number of selected component (if applicable):
2.85-4

How reproducible:
Always


Steps to Reproduce:
1. create user a12345678901234567890 using adduser or redhat-config-users
2. ls -la /home :observe home directory name and owner/group are shown
properly in full length
3. log in as that user
4. use w, who and observe you show only up as a1234567
5. logout
6. use last to observe you show only up as a1234567
   (which may be confusing, if, by coincidence, another user on the
   system is named a1234567
  
Actual results:
see above

Expected results:

login names should be shown in full length.If this is not
feasible for optical reasons (columns), the output should
mark them as cut off, and a command line option to display
them using the full name (distorting columns if needed)
should be available.


Additional info:

I know that historically, Unix had a 8char username limit. However
I thought these days were long gone. And especially with 32bit UIDs...