JERSEY-1713: Implement support for BV @ValidateExecutable

 - refactored and enhanced ConfiguredValidator (+impl)
 - added reference to validateMethod into AnnotatedMethod, IntrospectionModeller, Invocable
 - changed property in ServerProperties
 - caching in ConfiguredValidatorProvider and ConfiguredValidatorImpl
 - added e2e tests

Patch 2:

 - *Configuration -> *Config

Change-Id: Iee23be102e3912c0bc66de7e6be00c654b18d607