deamon.man allows the file that is including it to include extra text in
the description of --detach by defining a macro named DD. Only some of the
manpages that included it did this (only those manpages that needed extra
text there). But it's better to be quiet in "man --warnings", so this
defines DD to an empty value in the other manpages that include daemon.man.
Reported by lintian.
.SS "Daemon Options"
The daemon options apply only to the \fBmonitor\fR command. With any
other command, they have no effect.
+.ds DD
.so lib/daemon.man
.SS "Logging Options"
.so lib/vlog.man
.SS "Public Key Infrastructure Options"
.so lib/ssl.man
.so lib/ssl-peer-ca-cert.man
+.ds DD
.so lib/daemon.man
.so lib/vlog.man
.so lib/unixctl.man