Squashed commit of the following:

commit 065238d
Author: Guillem Nieto <gnieto@scopely.com>
Date:   Thu May 9 17:01:37 2019 +0200

    Cast to int wc jar count

    While using Kyuubi on my local environment (OSX) I'm having issues with
    `wc` returning the result with a preffixed tab character.

    Due to this issue, it fails to compare "	1" with "1" and script
    is aborted due to duplicated JARs found.

    To solve that, I'm casting `wc` result to integer and perform integer
    comparisions, which seems to solve the issue.

bin/start-kyuubi.sh

@@ -48,13 +48,14 @@ if [[ -z "$KYUUBI_JAR_DIR" ]]; then
 fi
 
 KYUUBI_JAR_NUM="$(ls ${KYUUBI_JAR_DIR} | grep kyuubi-server | grep .jar | grep -v original | wc -l)"
+KYUUBI_JAR_NUM=$((${KYUUBI_JAR_NUM}))
 
-if [[ ${KYUUBI_JAR_NUM} = "0" ]]; then
+if [[ ${KYUUBI_JAR_NUM} = 0 ]]; then
   echo "Kyuubi Server: need to build kyuubi first. Run ./build/mvn clean package" >&2
   exit 1
 fi
 
-if [[ ${KYUUBI_JAR_NUM} != "1" ]]; then
+if [[ ${KYUUBI_JAR_NUM} != 1 ]]; then
   echo "Kyuubi Server: duplicated kyuubi jars found. Run ./build/mvn clean package" >&2
   exit 1
 fi