Rename plugin directory to instrumentation (#779)

* Rename plugin directory to instrumentation

As per open-telemetry/opentelemetry-specification#539

* Update package paths

* Fix tracer names in othttp instrumentation

Author: MrAlias

example/grpc/client/main.go

@@ -23,7 +23,7 @@ import (
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/example/grpc/api"
 	"go.opentelemetry.io/otel/example/grpc/config"
-	"go.opentelemetry.io/otel/plugin/grpctrace"
+	"go.opentelemetry.io/otel/instrumentation/grpctrace"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"

example/grpc/server/main.go

@@ -25,7 +25,7 @@ import (
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/example/grpc/api"
 	"go.opentelemetry.io/otel/example/grpc/config"
-	"go.opentelemetry.io/otel/plugin/grpctrace"
+	"go.opentelemetry.io/otel/instrumentation/grpctrace"
 
 	"google.golang.org/grpc"
 )

example/http/client/client.go

@@ -29,7 +29,7 @@ import (
 	"go.opentelemetry.io/otel/api/correlation"
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/exporters/trace/stdout"
-	"go.opentelemetry.io/otel/plugin/httptrace"
+	"go.opentelemetry.io/otel/instrumentation/httptrace"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 

example/http/server/server.go

@@ -23,7 +23,7 @@ import (
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/trace"
 	"go.opentelemetry.io/otel/exporters/trace/stdout"
-	"go.opentelemetry.io/otel/plugin/httptrace"
+	"go.opentelemetry.io/otel/instrumentation/httptrace"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )
 

plugin/grpctrace/grpctrace.go instrumentation/grpctrace/grpctrace.goplugin/grpctrace/grpctrace.go renamed to instrumentation/grpctrace/grpctrace.go

@@ -67,7 +67,7 @@ func NewClientTrace(ctx context.Context) *httptrace.ClientTrace {
 		activeHooks: make(map[string]context.Context),
 	}
 
-	ct.tr = global.Tracer("go.opentelemetry.io/otel/plugin/httptrace")
+	ct.tr = global.Tracer("go.opentelemetry.io/otel/instrumentation/httptrace")
 
 	return &httptrace.ClientTrace{
 		GetConn:              ct.getConn,

plugin/grpctrace/interceptor.go instrumentation/grpctrace/interceptor.goplugin/grpctrace/interceptor.go renamed to instrumentation/grpctrace/interceptor.go

@@ -25,7 +25,7 @@ import (
 
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/kv"
-	"go.opentelemetry.io/otel/plugin/httptrace"
+	"go.opentelemetry.io/otel/instrumentation/httptrace"
 	export "go.opentelemetry.io/otel/sdk/export/trace"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 )