Separate OSGi aware from non-OSGi aware commands

While reviewing JCLOUDS-71 I realized that is not crystal clear which of commands are OSGi aware and which are non-OSGi aware. This is causing a lot of confusion and should be addressed.

So, most of the commands can be run both inside and outside OSGi (there are a couple of OSGi only commands). The fact that all commands inherit from Compute/BlobStoreCommandBase which contains OSGi specific properties make this very confusing. We should break the BaseCommands into something that makes it very clear if the command is OSGi specific or not.