When enable_elasticsearch is False, and kolla_internal_fqdn is set
and elasticsearch_address is the default, fluentd is still enabling
output to elasticsearch.
elasticsearch_address defaults to kolla_internal_fqdn, but the
check to enable logging to an "external" elasticsearch host
compares with kolla_internal_vip_address (fqdn != vip address).
This patch fixes the comparison to use the kolla_internal_fqdn.
Closes-Bug: #1927880
Change-Id: If23a6b1273c2639d1296becc9d222546d52f63ac
