issue #19 The value of property "plan" in template file is not quoted with "'"

Updated below 7 files to quote the "plan" property with single quotation mark:
./jobs/postgresql_node/templates/postgresql_node.yml.erb
./jobs/memcached_node/templates/memcached_node.yml.erb
./jobs/rabbit_node/templates/rabbit_node.yml.erb
./jobs/mysql_node/templates/mysql_node.yml.erb
./jobs/mongodb_node/templates/mongodb_node.yml.erb
./jobs/redis_node/templates/redis_node.yml.erb
./jobs/vblob_node/templates/vblob_node.yml.erb