Add E2E test for SAPM Exporter (#66)

SAPM trace test was using SAPM Receiver and Jaeger Exporter.
Now SAPM is used for both ends.

Author: tigrannajaryan

exporter/sapmexporter/go.mod

@@ -4,6 +4,7 @@ go 1.12
 
 require (
 	github.com/open-telemetry/opentelemetry-collector v0.2.1-0.20191119152140-567e1046cefa
+	github.com/pierrec/lz4 v2.0.5+incompatible // indirect
 	github.com/signalfx/sapm-proto v0.1.0
 	github.com/stretchr/testify v1.4.0
 	go.uber.org/atomic v1.5.1 // indirect

testbed/go.mod

@@ -3,8 +3,10 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/testbed
 go 1.12
 
 require (
-	github.com/open-telemetry/opentelemetry-collector v0.2.1-0.20191212224229-4e99ac7468fe
-	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sapmexporter v0.0.0-20191213033854-af8a37b00e74
-	github.com/open-telemetry/opentelemetry-collector/testbed v0.0.0-20191212224229-4e99ac7468fe
+	github.com/open-telemetry/opentelemetry-collector v0.2.1-0.20191213162008-563eac85a88c
+	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sapmexporter v0.0.0-20191213162202-55b8658da81a
+	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/sapmreceiver v0.0.0-20191213162202-55b8658da81a
+	github.com/open-telemetry/opentelemetry-collector/testbed v0.0.0-20191213162008-563eac85a88c
+	github.com/pierrec/lz4 v2.0.5+incompatible // indirect
 	go.uber.org/zap v1.13.0
 )