Multiple Changes:

1) For YCSB (multiple backends) and Hadoop Virtual Application types, the default behavior
is now to generate a whole new data set for every new load id (i.e., the load generating
process always gets executed against a fresh, newly-generated data set).

2) Improvements on VM ssh keypair manipulation. If a user does not set a default SSH key on
his/her cloud configuration file, then CB will create an ssh keypair on the cloud using
the "cbtool_rsa" pair as source. This should make CB deployments easier/faster.
IMPORTANT: The keypair cbtool_rsa is created by calling the "install" utility.

3) For OpenStack clouds, the parameter OSK_CREDENTIALS can now receive a 4th element,
indicating the path CA bundle file to use in verifying a TLS (https) server certificate.
Therefore, the two possible values for the OSK_CREDENTIALS are:

<user>-<password>-<tenant> (for connections through HTTP)

<user>-<password>-<tenant>-<cacert> (for connections through HTTPS)

4) Improvements and fixes for the API. Now the API calls get_latest_system_data,
get_latest_management_data and get_latest_app_data can be used independently from the
"refresh_vms" API call.