Fix mongodb upgrade accidentally.

install_orbit_environment.sh

@@ -99,6 +99,9 @@ function fix_downgrade_mongod(){
 	mongod_code="$(echo $?)"
 }
 function install_mongodb(){
+	if [[ "$2" == "1" ]]; then #reinstall
+		sudo rm -f /etc/apt/sources.list.d/mongodb-org-*
+	fi
 	case $1 in
 	3.2)
 		mongod_ver="3.2.22"