Add quiet option to git clone

Signed-off-by: Violeta Sebe <vsebe@ca.ibm.com>

Author: vsebe

closed/get_j9_source.sh

@@ -130,7 +130,7 @@ for i in "${!git_urls[@]}" ; do
 		fi
 		cd - > /dev/null
 	else
-		git_clone_command="git clone --recursive -b ${branch} ${git_urls[$i]} ${i}"
+		git_clone_command="git clone -q --recursive -b ${branch} ${git_urls[$i]} ${i}"
 		commands[$i]=$git_clone_command
 
 		echo