sslh: add http probe config

Signed-off-by: Gabor Seljan <sgabe@users.noreply.github.com>

net/sslh/files/sslh.config

@@ -10,6 +10,9 @@ config 'sslh' 'default'
 	# ssh defaults to 'localhost:22'
 	# --ssh <sshhost>:<sshport>
 	option 'ssh' ''
+	# http defaults to 'localhost:80'
+	# --http <httphost>:<httpport>
+	option 'http' ''
 	# ssl defaults to 'localhost:443'
 	# --ssl <sslhost>:<sslport>
 	option 'ssl' ''