Blocked until envoyproxy/envoy#16829 or an alternative gets merged upstream (or an alternative gets implemented here).

• modified include paths to match recent change done in the envoy repository (envoyproxy/envoy@0fae697), specifically:
  1. Move include/nighthawk up one level by running git mv include/nighthawk nighthawk.
  2. Use full paths on all #include statements referring to packages under the source/ directory.
  3. Fixing incorrect include paths (pre-existing) that were referring to envoy headers without the external/ prefix. This was reported by check_format after the above changes.
• Changing a bool to envoy::config::core::v3::DnsResolverOptions in a call to Envoy::Event::Dispatcher::createDnsResolver to match a recent Envoy change (envoyproxy/envoy@2c0e1f2).
• changing how the HTTP connection pool is accessed after it was moved behind a new class HttpPoolData in envoy (envoyproxy/envoy@ff2c0e5).
• after envoy switched to the true abseil type of string_view (envoyproxy/envoy@72bf41f), we can no longer assign absl::string_view to std::string. Changing Nighthawk code accordingly.

Signed-off-by: Jakub Sobon mumak@google.com