[cbcollect_info] Collect "getent ahosts <node>" information.
[cbcollect_info] Collect "getent ahosts <node>" information.

This is essentially about the same as dig/nslookup <node>, but it
actually uses the glibc's name resolution system, so it's more
comprehensive. For example, unlike dig/nslookup it accounts for
/etc/hosts file.

Change-Id: Ide06777285ccf56d7be6529f27ca3c2fe3b0032c
Reviewed-on: http://review.couchbase.org/89240
Tested-by: Aliaksey Artamonau <ce14b1c16e0fd654f926118eb8addbec5aff4ffa@couchbase.com>
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server