[SPARK-13823][CORE][STREAMING][SQL] Always specify Charset in String <-> byte[] conversions (and remaining Coverity items)

## What changes were proposed in this pull request?

- Fixes calls to `new String(byte[])` or `String.getBytes()` that rely on platform default encoding, to use UTF-8
- Same for `InputStreamReader` and `OutputStreamWriter` constructors
- Standardizes on UTF-8 everywhere
- Standardizes specifying the encoding with `StandardCharsets.UTF-8`, not the Guava constant or "UTF-8" (which means handling `UnuspportedEncodingException`)
- (also addresses the other remaining Coverity scan issues, which are pretty trivial; these are separated into commit https://github.com/srowen/spark/commit/1deecd8d9ca986d8adb1a42d315890ce5349d29c )

## How was this patch tested?

Jenkins tests

Author: Sean Owen <sowen@cloudera.com>

Closes #11657 from srowen/SPARK-13823.

1 files changed, 2 insertions, 2 deletions

diff --git a/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala b/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala
index 0b5ceb768c..1035056457 100644
--- a/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala
+++ b/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala
@@ -21,6 +21,7 @@ import java.io.{ByteArrayInputStream, DataInputStream, File, FileOutputStream, I
   OutputStreamWriter}
 import java.net.{InetAddress, UnknownHostException, URI}
 import java.nio.ByteBuffer
+import java.nio.charset.StandardCharsets
 import java.util.{Properties, UUID}
 import java.util.zip.{ZipEntry, ZipOutputStream}
 
@@ -29,7 +30,6 @@ import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet, ListBuffer, Map}
 import scala.util.{Failure, Success, Try}
 import scala.util.control.NonFatal
 
-import com.google.common.base.Charsets.UTF_8
 import com.google.common.base.Objects
 import com.google.common.io.Files
 import org.apache.hadoop.conf.Configuration
@@ -619,7 +619,7 @@ private[spark] class Client(
       val props = new Properties()
       sparkConf.getAll.foreach { case (k, v) => props.setProperty(k, v) }
       confStream.putNextEntry(new ZipEntry(SPARK_CONF_FILE))
-      val writer = new OutputStreamWriter(confStream, UTF_8)
+      val writer = new OutputStreamWriter(confStream, StandardCharsets.UTF_8)
       props.store(writer, "Spark configuration.")
       writer.flush()
       confStream.closeEntry()