Fix spray-json import to comply with newer versions. (#263)

diff --git a/tests/src/test/scala/system/packages/KafkaProduceTests.scala b/tests/src/test/scala/system/packages/KafkaProduceTests.scala
index 223bd56..85d5007 100644
--- a/tests/src/test/scala/system/packages/KafkaProduceTests.scala
+++ b/tests/src/test/scala/system/packages/KafkaProduceTests.scala
@@ -35,7 +35,7 @@
 import common.WskProps
 import common.WskTestHelpers
 import spray.json.DefaultJsonProtocol._
-import spray.json.pimpAny
+import spray.json._
 
 @RunWith(classOf[JUnitRunner])
 class KafkaProduceTests
diff --git a/tests/src/test/scala/system/packages/MessageHubMultiWorkersTest.scala b/tests/src/test/scala/system/packages/MessageHubMultiWorkersTest.scala
index 7ea14ec..20caa7a 100644
--- a/tests/src/test/scala/system/packages/MessageHubMultiWorkersTest.scala
+++ b/tests/src/test/scala/system/packages/MessageHubMultiWorkersTest.scala
@@ -34,7 +34,7 @@
 import common.WskProps
 import common.WskTestHelpers
 import spray.json.DefaultJsonProtocol._
-import spray.json.{pimpAny, _}
+import spray.json._
 import whisk.core.WhiskConfig
 import whisk.core.database.test.ExtendedCouchDbRestClient
 import whisk.utils.{JsHelpers, retry}
diff --git a/tests/src/test/scala/system/packages/MessageHubProduceTests.scala b/tests/src/test/scala/system/packages/MessageHubProduceTests.scala
index 37a5bd9..214fc55 100644
--- a/tests/src/test/scala/system/packages/MessageHubProduceTests.scala
+++ b/tests/src/test/scala/system/packages/MessageHubProduceTests.scala
@@ -37,7 +37,7 @@
 import common.WskTestHelpers
 
 import spray.json.DefaultJsonProtocol._
-import spray.json.pimpAny
+import spray.json._
 
 import java.util.Base64
 import java.nio.charset.StandardCharsets
diff --git a/tests/src/test/scala/system/stress/StressTest.scala b/tests/src/test/scala/system/stress/StressTest.scala
index d554d85..b174323 100644
--- a/tests/src/test/scala/system/stress/StressTest.scala
+++ b/tests/src/test/scala/system/stress/StressTest.scala
@@ -33,7 +33,7 @@
 import common.WskProps
 import common.WskTestHelpers
 import spray.json.DefaultJsonProtocol._
-import spray.json.pimpAny
+import spray.json._
 
 
 @RunWith(classOf[JUnitRunner])
diff --git a/tests/src/test/scala/system/utils/KafkaUtils.scala b/tests/src/test/scala/system/utils/KafkaUtils.scala
index ba8a6e9..be17d6c 100644
--- a/tests/src/test/scala/system/utils/KafkaUtils.scala
+++ b/tests/src/test/scala/system/utils/KafkaUtils.scala
@@ -29,9 +29,7 @@
 import scala.collection.mutable.ListBuffer
 
 import spray.json.DefaultJsonProtocol._
-import spray.json.JsObject
-import spray.json.JsArray
-import spray.json.pimpAny
+import spray.json._
 
 import whisk.utils.JsHelpers