HADOOP-13533. Do not require user to set HADOOP_SSH_OPTS to a non-null string, allow setting of an empty string. (Albert Chu via aw) closes #121

Signed-off-by: Allen Wittenauer <aw@apache.org>

hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh

@@ -596,7 +596,7 @@ function hadoop_basic_init
   HADOOP_ROOT_LOGGER=${HADOOP_ROOT_LOGGER:-${HADOOP_LOGLEVEL},console}
   HADOOP_DAEMON_ROOT_LOGGER=${HADOOP_DAEMON_ROOT_LOGGER:-${HADOOP_LOGLEVEL},RFA}
   HADOOP_SECURITY_LOGGER=${HADOOP_SECURITY_LOGGER:-INFO,NullAppender}
-  HADOOP_SSH_OPTS=${HADOOP_SSH_OPTS:-"-o BatchMode=yes -o StrictHostKeyChecking=no -o ConnectTimeout=10s"}
+  HADOOP_SSH_OPTS=${HADOOP_SSH_OPTS-"-o BatchMode=yes -o StrictHostKeyChecking=no -o ConnectTimeout=10s"}
   HADOOP_SECURE_LOG_DIR=${HADOOP_SECURE_LOG_DIR:-${HADOOP_LOG_DIR}}
   HADOOP_SECURE_PID_DIR=${HADOOP_SECURE_PID_DIR:-${HADOOP_PID_DIR}}
   HADOOP_SSH_PARALLEL=${HADOOP_SSH_PARALLEL:-10}