deploy: Remove version dependencies

Remove dependencies to specific versions of snf-image and blktap-utils.
Rename blktap-utils to blktap-archipelago-utils
Add release date for v0.16
Bump version to 0.16rc2
Fix indentation issues in Changelog
deploy: Remove not needed setting

Since Synnefo v0.16 we no longer use the java vnc console, so this
setting isn't needed.