Update infra components list in README.rst
Update infra components list in README.rst

The following project links have been added and reorder:
- Telegraf
- Etcd
- Memcached

Also fix some syntax issues.

Change-Id: I8b1ba2bbe8334d84c8247aef35f443b61b27fbf5

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible