HBASE-18355 Enable export snapshot tests that were disabled by Proc-V2 AM in HBASE-14614

hbase-mapreduce/pom.xml

@@ -298,6 +298,13 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <!-- Hadoop needs Netty 3.x at test scope for the minicluster -->
+    <dependency>
+      <groupId>io.netty</groupId>
+      <artifactId>netty</artifactId>
+      <version>${netty.hadoop.version}</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
   <profiles>
     <!-- Skip the tests in this module -->

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/snapshot/TestExportSnapshot.java

@@ -64,7 +64,6 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos.Snapshot
 /**
  * Test Export Snapshot Tool
  */
-@Ignore
 @Category({VerySlowMapReduceTests.class, LargeTests.class})
 public class TestExportSnapshot {
   @Rule public final TestRule timeout = CategoryBasedTimeout.builder().

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/snapshot/TestMobExportSnapshot.java

@@ -32,7 +32,6 @@ import org.junit.experimental.categories.Category;
 /**
  * Test Export Snapshot Tool
  */
-@Ignore
 @Category({VerySlowRegionServerTests.class, LargeTests.class})
 public class TestMobExportSnapshot extends TestExportSnapshot {
 

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/snapshot/TestMobSecureExportSnapshot.java

@@ -33,7 +33,6 @@ import org.junit.experimental.categories.Category;
 /**
  * Reruns TestMobExportSnapshot using MobExportSnapshot in secure mode.
  */
-@Ignore
 @Category({VerySlowRegionServerTests.class, LargeTests.class})
 public class TestMobSecureExportSnapshot extends TestMobExportSnapshot {
   @BeforeClass

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/snapshot/TestSecureExportSnapshot.java

@@ -36,7 +36,6 @@ import org.junit.rules.TestRule;
 /**
  * Reruns TestExportSnapshot using ExportSnapshot in secure mode.
  */
-@Ignore
 @Category({VerySlowRegionServerTests.class, LargeTests.class})
 public class TestSecureExportSnapshot extends TestExportSnapshot {
   @Rule public final TestRule timeout = CategoryBasedTimeout.builder().