* updating usage of http2_protocol_options and access_log_path
* add changelog
* update template for AdminAccessLogConfig
* remove mucking with AdminAccessLogConfig
This is being added so that metrics sent to HCP can be augmented with the source node's ID.
Opting not to add this to stats_tag out of caution, since it would increase the cardinality of metrics emitted by Envoy for all users.
There is no functional impact to Envoy expected from this change.