Update glance content for Juno

I updated glance content in the installation guide for Juno
as follows:

1) Removed prompts specific to MySQL because most distributions
   will use MariaDB.
2) Explicitly created endpoint with 'regionOne' region to avoid
   inconsistent defaults.
3) Recommended enabling verbose logging.
4) Replace 'auth_*' keys with 'identity_uri' key.
5) Added example command output.
6) Changed CirrOS version to 0.3.3 which affects several other
   files.

Change-Id: Id12735744bc44d884e4519d17cc317b703e3ab85
Merge "Update glance content for Juno"