[FLINK-2774] [scala shell] Extended default imports for ScalaShell

This closes #1247

-- PRs closed due to inactivity
This closes #1077

flink-staging/flink-scala-shell/src/main/scala/org/apache/flink/api/scala/FlinkILoop.scala

@@ -96,8 +96,22 @@ class FlinkILoop(
   }
 
   private val packageImports = Seq[String](
+    "org.apache.flink.core.fs._",
+    "org.apache.flink.core.fs.local._",
+    "org.apache.flink.api.common.io._",
+    "org.apache.flink.api.common.aggregators._",
+    "org.apache.flink.api.common.accumulators._",
+    "org.apache.flink.api.common.distributions._",
+    "org.apache.flink.api.common.operators._",
+    "org.apache.flink.api.common.operators.base.JoinOperatorBase.JoinHint",
+    "org.apache.flink.api.common.functions._",
+    "org.apache.flink.api.java.io._",
+    "org.apache.flink.api.java.aggregation._",
+    "org.apache.flink.api.java.functions._",
+    "org.apache.flink.api.java.operators._",
+    "org.apache.flink.api.java.sampling._",
     "org.apache.flink.api.scala._",
-    "org.apache.flink.api.common.functions._"
+    "org.apache.flink.api.scala.utils._"
   )
 
   override def createInterpreter(): Unit = {