Handle properly hashes for modbus SR.

slapos/software/osie-coupler/buildout-modbus.hash.cfg

+[instance-profile]
+filename = instance-modbus.cfg.in
+md5sum = 8637c6b714a0bb9f27c86f3928049b98

slapos/software/osie-coupler/buildout.hash.cfg

-[instance-profile]
-filename = instance.cfg.in
-md5sum = 16f6538f754919b5e894e85fd78ffbab

slapos/software/osie-coupler/software-modbus.cfg

@@ -2,7 +2,7 @@
 [buildout]
 allow-picked-versions = true
 extends =
-  buildout.hash.cfg
+  buildout-modbus.hash.cfg
   https://lab.nexedi.com/nexedi/slapos/raw/master/stack/monitor/buildout.cfg
   https://lab.nexedi.com/nexedi/slapos/raw/master/stack/slapos.cfg
   https://lab.nexedi.com/nexedi/slapos/raw/master/component/python3/buildout.cfg