- style, cleanup, and removal of unnecessary code
- combine isc_nm_http_add_endpoint() and isc_nm_http_add_doh_endpoint()
into one function, renamed isc_http_endpoint()
- move isc_nm_http_connect_send_request() into doh_test.c as a helper
function; remove it from the public API
- renamed isc_http2 and isc_nm_http2 entities to just isc_http and
isc_nm_http, for consistency with other existing names
- shortened a number of long names
- the caller is now responsible for determining the peer address
in isc_nm_httpconnect(); this eliminates the need to parse the URI
and the dependency on an external resolver. the caller is also now
responsible for creating the SSL client context, for consistency with
isc_nm_tlsdnsconnect().
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