ns_server is still validating ip address in ip file even if erlang already has node name defined (was: 2.0 Build 1941: Couchbase Server does not start after a change in IP, server is looking for the old IP even after the hostname resolves to the new one.)

Couchbase Server does not start after a change in IP, server is looking for the old IP even after the hostname resolves to the new one. Followed the best-practices information to configure the hostname in the couchbase-server file and this issue is reproducible in the 1941 2.0 build.

Error messages from the log:
[ns_server:info,2012-11-16T13:16:45.502,ns_1@FQDN:dist_manager<0.2732.0>:dist_manager:read_address_config:55]Reading ip config from "/opt/couchbase/var/lib/couchbase/ip"
[ns_server:warn,2012-11-16T13:16:45.522,ns_1@FQDN:dist_manager<0.2732.0>:dist_manager:is_good_address:81]Cannot listen on address `OLD IP`: eaddrnotavail

The logs are available in the link below:
https://s3.amazonaws.com/customers.couchbase.com/jawfishgames/couch14-build-1914.zip

update:

Apparently as part of process of setting up node name folks just left original /opt/couchbase/var/lib/couchbase/ip. And ns_server's bug is due to attempt to validate that address even though it won't be actually used.