fix ASF copyright headers on SoftLayer
Remove Java 6 litter
Merge identical tests
JCLOUDS-658: xattr for filesystem blob metadata

This allows the filesystem blobstore to mimic real blobstores more
accurately.  This also doubles the speed of getBlob by storing the
Content-MD5 header instead of recalculating it.
JCLOUDS-662: Support multiple disks with the same size using SoftLayerTemplateOptions
JCLOUDS-496: Use the security groups options in the portable TemplateOptions
JCLOUDS-658: use xattr only on supported systems

Mac OS X HFS+ does not support UserDefinedFileAttributeView:

https://bugs.openjdk.java.net/browse/JDK-8030048
Prefer Regions to Zones in OpenStack APIs
Removed @Nullable annotations on region parameters
JCLOUDS-661: Adding a test for single-port firewall rules