Clarify OpenStack metadata
Add the beginning section for testing a ping between two VMs.
Finish VM to VM ping.
Actually, make it test the security group filtering, too.
Fixed from raw html to correct markdown for link.
Check list formats.
Merge pull request #245 from cloudfoundry/openstack

Clarify OpenStack metadata
merging PR 246
merging PR 246
Merge branch 'programsam-master'