s3-daemons: Set the comment field of the daemons.

s3-daemons: Set the comment field of the daemons.

PR_SET_NAME sets the comm field of a process. This way we can give
processes a name and they are easier to identify.

$ ps afx -o pid,comm
29447 smbd
29452  \_ epmd
29453  \_ lsasd-master
29455  |   \_ lsasd-child
29457  |   \_ lsasd-child
29459  |   \_ lsasd-child
29461  |   \_ lsasd-child
29463  |   \_ lsasd-child
29454  \_ spoolssd-master
29456      \_ lpqd
29458      \_ spoolssd-child
29460      \_ spoolssd-child
29462      \_ spoolssd-child
29465      \_ spoolssd-child
29466      \_ spoolssd-child
29467      \_ spoolssd-child
29468      \_ spoolssd-child
29469      \_ spoolssd-child
29470      \_ spoolssd-child
29471      \_ spoolssd-child

Reviewed-by: David Disseldorp <ddiss@samba.org>