JCLOUDS-534: Upgrade to Guava 17.0

Release notes:

https://code.google.com/p/guava-libraries/wiki/Release17
JCLOUDS-505: Remove unused ObjectMD5

The only users of this seem to be
org.jclouds.atmos.blobstore.strategy.FindMD5InUserMetadata and
org.jclouds.azureblob.blobstore.strategy.FindMD5InBlobProperties which
are themselves unused.
Address Checkstyle violations
JCLOUDS-561: Properly populate the ssh agent connection in the builder methods
Enforce that all commas have trailing whitespace
Enable whitespace around Checkstyle rule
Updated ServiceType refs in Cloud Databases
Remove deprecation from getConsistencyModel

This method informs callers of the expected blobstore behavior,
avoiding unnecessary work for providers which support strict
consistency (Azure, mock blobstores).