Enforce ASF copyright header via Checkstyle
Remove maven-license-plugin

This never seemed to work and we will enforce license text via
Checkstyle instead.
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.
fix creation of blockDevices using SoftLayerTemplateOptions