login.conf(5): set a default PATH for the daemon class

This is a sensible default used by, e.g., cron(8), and useful if one wanted
to honor it.

This is a part of D21481.

Submitted by:	Andrew Gierth <andrew_tao173.riddles.org.uk>

usr.bin/login/login.conf

@@ -61,7 +61,13 @@ xuser:\
 	:tc=default:
 staff:\
 	:tc=default:
+
+# This PATH may be clobbered by individual applications.  Notably, by default,
+# rc(8), service(8), and cron(8) will all override it with a default PATH that
+# may not include /usr/local/sbin and /usr/local/bin when starting services or
+# jobs.
 daemon:\
+	:path=/sbin /bin /usr/sbin /usr/bin /usr/local/sbin /usr/local/bin:\
 	:mail@:\
 	:memorylocked=128M:\
 	:tc=default: