Merge pull request #167 from Infinidat/pull_request_5

white space consistency
Update README.rst to include intros

Some developers won't read entire sentences. It's important to summarize the short instructions into shorter notes and sentence fragments for those in a hurry.
test mounting a disk

This test demonstrates how to mount a disk onto a VM assuming
that the disk and the VM exist. The test uses a SCSI controller
and a preconfigured VM.