change NotThreadSafe annotiation for the fallback tests

Author: nimf

google-cloud-bigtable/pom.xml

@@ -346,6 +346,12 @@
       <artifactId>guava-testlib</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.github.stephenc.jcip</groupId>
+      <artifactId>jcip-annotations</artifactId>
+      <version>1.0-1</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <profiles>

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/gaxx/grpc/fallback/GcpFallbackChannelTest.java

@@ -84,7 +84,6 @@
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Function;
 import javax.annotation.Nonnull;
-import javax.annotation.concurrent.NotThreadSafe;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -93,6 +92,7 @@
 import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.junit.MockitoJUnitRunner;
+import net.jcip.annotations.NotThreadSafe;
 
 @NotThreadSafe
 @RunWith(MockitoJUnitRunner.class)