Make FileSystem service Configurable

[avano]

• create a FileSystemConfiguration class, where the configuration entry is the application name
• create an abstract FileSystemValidation class where all abstract methods from FileSystem class will be moved
• create a LocalFileSystemValidation and OpenShiftFileSystemValidation and implement the abstract methods
• also move all other methods interacting with the filesystem from OpenshiftFileSystem to the
• in FileSystem class validation() method create a correct instance of either Local- or Openshift- FileSystemValidation
• Simplify openshift method implementations using PodShell class from XTF (OpenshiftClient.get().podShell()) where applicable
• Check whether podIsReady in needed at all, because I doubt so
• Don't throw IOException in the validation methods