opentelemetry-otlp: Default the port correctly.

Current behavior uses http-proto port even when there's no desire to use
it.

Relates open-telemetry#1509

Signed-off-by: Harold Dost <h.dost@criteo.com>

Author: hdost

opentelemetry-otlp/CHANGELOG.md

@@ -2,8 +2,14 @@
 
 ## vNext
 
-- **Breaking** Remove support for surf HTTP client [#1537](https://github.com/open-telemetry/opentelemetry-rust/pull/1537)
+### Fixed
+- Fix `tonic()` to the use correct port. [#1556](https://github.com/open-telemetry/opentelemetry-rust/pull/1556)
+
+### Changed
 - Update to tonic 0.11 and prost 0.12 (#1536)
+
+### Removed
+- **Breaking** Remove support for surf HTTP client [#1537](https://github.com/open-telemetry/opentelemetry-rust/pull/1537)
 - Remove support for grpcio transport (#1534)
 
 ## v0.14.0

opentelemetry-otlp/src/exporter/tonic/mod.rs

@@ -149,6 +149,7 @@ impl Default for TonicExporterBuilder {
         TonicExporterBuilder {
             exporter_config: ExportConfig {
                 protocol: crate::Protocol::Grpc,
+                endpoint: crate::exporter::default_endpoint(crate::Protocol::Grpc),
                 ..Default::default()
             },
             tonic_config,

opentelemetry-otlp/tests/integration_test/tests/traces.rs

@@ -6,7 +6,6 @@ use opentelemetry::{
     trace::{TraceContextExt, Tracer},
     Key, KeyValue,
 };
-use opentelemetry_otlp::WithExportConfig;
 use opentelemetry_sdk::{runtime, trace as sdktrace, Resource};
 use std::error::Error;
 use std::fs::File;
@@ -17,8 +16,7 @@ fn init_tracer() -> Result<sdktrace::Tracer, TraceError> {
         .tracing()
         .with_exporter(
             opentelemetry_otlp::new_exporter()
-                .tonic()
-                .with_endpoint("http://localhost:4317"),
+                .tonic(),
         )
         .with_trace_config(
             sdktrace::config().with_resource(Resource::new(vec![KeyValue::new(