Rename integration-testing to interop-testing

"Interoperability" is a more appropriate name for the tests, since they
are used for testing across different implementations. They will do a
bit of integration testing, like for auth, but this is a smaller scale.

It seems the other languages (Go, C++, Node, PHP, Python, Ruby) are
using "interop" to describe the tests, and the test case specifications
document is named with "interop". After this change, C# will be the only
language calling them "integration" tests.

This change just renames the folder and artifact. We can change the
internal package names later. However, once we do a release, old
artifact names will live forever in Maven Central.

README.md

@@ -177,4 +177,4 @@ The 'transport' layer does the heavy lifting of putting & taking bytes off the w
 
 ### Examples
 
-Tests showing how these layers are composed to execute calls using protobuf messages can be found here https://github.com/google/grpc-java/tree/master/integration-testing/src/main/java/io/grpc/testing/integration
+Tests showing how these layers are composed to execute calls using protobuf messages can be found here https://github.com/google/grpc-java/tree/master/interop-testing/src/main/java/io/grpc/testing/integration

benchmarks/build.gradle

@@ -36,7 +36,7 @@ dependencies {
                  project(':grpc-netty'),
                  project(':grpc-okhttp'),
                  project(':grpc-stub'),
-                 project(':grpc-integration-testing'),
+                 project(':grpc-interop-testing'),
                  libraries.junit,
                  libraries.mockito,
                  libraries.hdrhistogram]

run-test-client.sh

@@ -2,6 +2,6 @@
 cd "$(dirname "$0")"
 cat >&2 <<EOF
 Gradle is no longer run automatically. Make sure to run './gradlew installDist' or
-'./gradlew :grpc-integration-testing:installDist' after any changes.
+'./gradlew :grpc-interop-testing:installDist' after any changes.
 EOF
-exec ./integration-testing/build/install/grpc-integration-testing/bin/test-client "$@"
+exec ./interop-testing/build/install/grpc-interop-testing/bin/test-client "$@"

run-test-server.sh

@@ -2,6 +2,6 @@
 cd "$(dirname "$0")"
 cat >&2 <<EOF
 Gradle is no longer run automatically. Make sure to run './gradlew installDist' or
-'./gradlew :grpc-integration-testing:installDist' after any changes.
+'./gradlew :grpc-interop-testing:installDist' after any changes.
 EOF
-exec ./integration-testing/build/install/grpc-integration-testing/bin/test-server "$@"
+exec ./interop-testing/build/install/grpc-interop-testing/bin/test-server "$@"

settings.gradle

@@ -7,7 +7,7 @@ include ":grpc-protobuf"
 include ":grpc-protobuf-nano"
 include ":grpc-netty"
 include ":grpc-testing"
-include ":grpc-integration-testing"
+include ":grpc-interop-testing"
 include ":grpc-all"
 include ":grpc-benchmarks"
 include ":grpc-examples"
@@ -20,7 +20,7 @@ project(':grpc-protobuf').projectDir = "$rootDir/protobuf" as File
 project(':grpc-protobuf-nano').projectDir = "$rootDir/protobuf-nano" as File
 project(':grpc-netty').projectDir = "$rootDir/netty" as File
 project(':grpc-testing').projectDir = "$rootDir/testing" as File
-project(':grpc-integration-testing').projectDir = "$rootDir/integration-testing" as File
+project(':grpc-interop-testing').projectDir = "$rootDir/interop-testing" as File
 project(':grpc-all').projectDir = "$rootDir/all" as File
 project(':grpc-benchmarks').projectDir = "$rootDir/benchmarks" as File
 project(':grpc-examples').projectDir = "$rootDir/examples" as File