The values user0 and user1 do not map to valid facility values.
local1, etc. Using user0 results in a pri value that does not map
back to a facility of the same name in syslog.
RFC5424 suggest values values of local0 through local7. Setting
syslog_log_facility to one of those values results in a message with a
priority that can be mapped back to the original string value.
This fix adjusts the comment in rootwrap.conf to suggest the local
prefix instead of the user prefix.
Change-Id: I835ad17c817b8623e382368b39b06944470be480
Closes-bug: #1280879
a5a8e2db49