resources.conf: Move nanobts address to differentiate them from local IPs

nanobts IP addresses are assigned through DHCP, and are not local to the
main unit. Let's use another subset for this DHCP pool as we usually use
.50ish for static local IP addresses.

Change-Id: Ibdb0dd97a490aaa555a7bf53cf43cc5a5533a012
diff --git a/example/resources.conf.prod b/example/resources.conf.prod
index 230f95d..8a9a534 100644
--- a/example/resources.conf.prod
+++ b/example/resources.conf.prod
@@ -47,7 +47,7 @@
 - label: NanoBTS-ONW-1900
   type: nanobts
   ipa_unit_id: 9
-  addr: 10.42.42.53
+  addr: 10.42.42.120
   band: GSM-1900
   power_supply:
     type: 'sispm'
@@ -57,7 +57,7 @@
 - label: NanoBTS-ONW-900
   type: nanobts
   ipa_unit_id: 10
-  addr: 10.42.42.54
+  addr: 10.42.42.121
   band: GSM-900
   power_supply:
     type: 'sispm'