deps: grpc-alts is only used for tests (#757)

Author: olavloite

google-cloud-spanner/pom.xml

@@ -142,16 +142,6 @@
  <groupId>io.grpc</groupId>
  <artifactId>grpc-protobuf</artifactId>
  </dependency>
- <dependency>
- <groupId>io.grpc</groupId>
- <artifactId>grpc-alts</artifactId>
- <scope>runtime</scope>
- </dependency>
- <!--
- grpc-stub is needed directly by our tests and transitively by grpc-alts at runtime.
- So it has to be declared as a direct dependency and to avoid overriding grpc-alts'
- runtime requirement it has to be promoted to the runtime scope.
- -->
  <dependency>
  <groupId>io.grpc</groupId>
  <artifactId>grpc-stub</artifactId>
@@ -264,6 +254,13 @@
  <scope>test</scope>
  </dependency>
 
+ <!-- Test dependency for DirectPath -->
+ <dependency>
+ <groupId>io.grpc</groupId>
+ <artifactId>grpc-alts</artifactId>
+ <scope>test</scope>
+ </dependency>
+
  <!-- Need testing utility classes for generated gRPC clients tests -->
  <dependency>
  <groupId>com.google.api</groupId>