Move FlagResetRule from core to testing

Author: jdcormie

core/src/test/java/io/grpc/internal/DnsNameResolverTest.java

@@ -60,6 +60,7 @@
 import io.grpc.internal.JndiResourceResolverFactory.JndiResourceResolver;
 import io.grpc.internal.JndiResourceResolverFactory.RecordFetcher;
 import io.grpc.internal.SharedResourceHolder.Resource;
+import io.grpc.internal.testing.FlagResetRule;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;

core/src/test/java/io/grpc/internal/ManagedChannelImplBuilderTest.java

@@ -52,6 +52,7 @@
 import io.grpc.internal.ManagedChannelImplBuilder.ClientTransportFactoryBuilder;
 import io.grpc.internal.ManagedChannelImplBuilder.FixedPortProvider;
 import io.grpc.internal.ManagedChannelImplBuilder.UnsupportedClientTransportFactoryBuilder;
+import io.grpc.internal.testing.FlagResetRule;
 import io.grpc.testing.GrpcCleanupRule;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;

…java/io/grpc/internal/FlagResetRule.java …grpc/internal/testing/FlagResetRule.javacore/src/testFixtures/java/io/grpc/internal/FlagResetRule.java renamed to testing/src/main/java/io/grpc/internal/testing/FlagResetRule.java core/src/testFixtures/java/io/grpc/internal/FlagResetRule.java renamed to testing/src/main/java/io/grpc/internal/testing/FlagResetRule.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.grpc.internal;
+package io.grpc.internal.testing;
 
 import java.util.ArrayDeque;
 import java.util.Deque;