config: Simplify how overrides are applied

config: Fix excessive change notifications

config: fix config reload

When reloading default config reset the previous dynamic properties so the new client name is applied

config: Dynamic properties that are only scoped to the client (no default)

# Conflicts:
#	ribbon-core/src/main/java/com/netflix/client/config/ReloadableClientConfig.java

config: Property for mapping multiple property values with prefix

config: Method to get config if it's set without reading properties

feature: Fix returning Property defaults

The current mechanism for returning property default values is a bit awkward because of how property overrides are applied.  This change addresses that by adding an explicit `getOrDefault` api.

config: API to get a config's PropertyResolver

config: PropertyResolver

Further decouple Ribbon's config from a property source by introducing using a PropertyResolver abstraction.

Add missing default values

config: custom types with valueOf

Supporting collections and custom types with dynamic config requires a great deal of custom code.  This can be greatly simplified by supporting deserialization using a valueOf static method of any type.

config: forEach methods to iterate config

**What?**
`forEach` and `forEachDefault` methods to iterate config by `IClientConfigKey`.

**Why?**
This will make it easier to clone or copy config from one config to another

config: Decouple dynamic config reloading from archaius

**What?**
- New AbstractReloadableClientConfig class that implements its own version of dynamic configuration loading.
- Allow for default values to be picked up dynamically

**Why?**
This is part of the effort to completely decouple ribbon from archaius to reduce dependencies and allow for easier integration with other configuration sub systems

Deprecate config apis

**What?**
- Deprecate all `DefaultClientConfigImpl` static defaults in favor of `CommonClientConfigKey` contain the default values
- Deprecate `IClientConfig#[setProperty, withProperty, containsProperty, setProperty, getPropertyAsInteger, getPropertyAsString, getPropertyAsBoolean]` all of which are replaced by `get` and `set`.
- Eliminate the awkward pattern of excessive conversion to and parsing of config string
- Leverage Java8 Optional to simplify config loading code

**Why?**
This is part of a long needed cleanup to simplify configuration loading

Fix client name being null

Fix LBStats default config loading

configuration: Decouple static archaius

**Motivation**
Ribbon makes heavy use of Archaius in a static manner for configuration.  This pattern couple Ribbon with legacy archaius and its dependencies and makes it hard to run tests in parallel. By decoupling from both archaius and statics users can now provide alternative configuration mechanisms as well as improve testability.

**Changes**
- Introduce a new DynamicPropertyRepository abstraction to decouple from Archaius specific APIs
- For legacy support make the ArchaiusDynamicPropertyRepository discoverable via the service loader.
- Allow a non-static DynamicPropertyRepository to be associated with a IClientConfig.  This is a bit of a hack but minimizes code changes.
- Decouple all build.gradle dependencies from archaius, except for the ribbon-archaius subproject
- Pick up @zone from DynamicPropertyRepository and NOT from archaius's DeploymentContext
- Remove configuration for PollingServerListUpdater as it is not used and would always require static configuration

Pluggable object creation

Make the object creation mechanism during client creation pluggable for better integration with DI containers.

Decouple core library from archaius1