Deconstruct wildfly-clustering-common

wildfly-clustering-common began as a module to house code common to clustering-related subsystem modules (e.g. infinispan, jgroups, singleton, mod_cluster, etc). While this module is currently still a dumping ground of sorts, the majority of the code contained within makes up a framework for quickly building and evolving subsystems, with minimal boilerplate code, including:

• Simplified model/operation/attribute/metric registration
• Interfaces for enumerating schema and management model versions, used for parameterizing parsers and transfomers
• Generic add/remove operation handlers with a clean distinction between runtime behavior and model behavior.
• Mechanisms for easily renaming/relocating management attributes
• Abstractions for using capabilities
• Generic Resource decorator augmented to support additional runtime children.
• Abstractions for correctly implementing runtime operations and metrics using values from an MSC service
• Abstractions for complex transformers

On top of subsystem development abstractions, this module also contains:

• Abstractions for contextual execution
  • Move to separate module
• Service configurator for JNDI bindings
  • Move to separate module
• Helper methods for obtaining optional model values
  • These are largely redundant now
• Common Function/Predicate/Consumer implementations
  • These can likely be replaced with implementations from wildfly-common or guava

Once cleaned up, and excess dependencies eliminated, we can rename it to something more descriptive (e.g. wildfly-subsystem).