Bug 2366 - Effective statments impl merge, retest & bugfix

- rebase
- integrated changes from https://git.opendaylight.org/gerrit/#/c/21310
- added some JavaDoc, minor fixes in null checking, unneeded code, refactoring etc.
- minor fixes in hashCode(), equals(), getters etc.
- list key relative path fix
- list keys resolution fix
- multiple modules and revisions fix
- rebase on master
- instance identifier type build fix
- bug2649 test
- re-sync of retest with old impl folder (old parser vs. new parser)
- buildType qname fix
- non YANG statement detection implemented
- uses-augment module qname fix
- uses-augment is augmenting fix
- type constraints parsing and validation fix
- Unique statement support added
- identityRef validation simplification
- typedef base type QName resolution fix
- parse with context fix
- typedef order unit test fix
- invalid string patterns parsing fix
- refine unknown statements fix
- union types order fix
- typedef in grouping fix
- identityRef null identity fix
- pick latest revision even when not reverse chronologicaly ordered in module fix
- clean up of SourceSpecificContext & YangStatementParserListenerImpl classes, rebased on master
- types, extended types and type definitions impl and bugfix
- declared types resolution
- statementSourceReference support implemented
- basicType impl proposal
- typeDefEffStmt impl as builder of ExtendedType
- few decl. types resolution fixes done
- identityRefs validation implemented
- fixed tests dealing with unknown stmts
- uses getRefine fix
- load with context retest
- ordering of statements and substatements fix
- augment into unknown statement body fix
- uses or augment in unknown statement body fix
- extension identifier correctly passed to unknown statement for effective resolution phase
- substatements of included submodules appendation fix
- node name collision validation
- refine target validation
- added statement copy type by both Augment and Uses (when augmenting in uses statement)
- some of negative scenarios (arguments/statements validation) fix
- fix of module imports, revision
- augmentation namespace and revision initialization fix
- available augmentation impl fix
- Case shorthand schema path fix
- Case shorthand fix
- Unsupported augment targets fix
- Multiple augments to the same target - reactor fix
- StackOverflowException on cyclic identity hierarchy fix
- include vs. belongsTo linkage resolution fix
- introduces replacement of old YANG parser by new statement parser in
set of existing tests
- some test methods adjusted for new parser data structure

- Types & TypeDefs support & resolution implemented
- BelongsTo namespace added to be able to resolve typedefs from parent
  modules - Identity, IdentityRef support & resolution preparation
- Minor sonar issues fixed
- Effective statements related to types implemented

Bug 2366 - Effective statements implementation (2nd patch)

- added further implementation of Module and Submodule Effective statements and
  initialization of submodules collection in Module effective statement
- implementation of uses-refine
- implementation of Constraints, etc...
- effective statement fields initialization
- added unit tests
- fix of some issues in the parser (ModuleQName default revision date,
  Generics, etc..)

Bug 2366 - Identity, Refine, ... effective statements impl. (3th patch)

- implementation of Identity effective statement
- implementation of Refine effective statement
- initialization of some unitialized effective statments fields
- augmentation process fix
- unit tests

Change-Id: I95cda640136c966bd1b1fd3b0bcb1e143675eac1
Signed-off-by: Peter Kajsa <pkajsa@cisco.com>
Signed-off-by: Martin Ciglan <mciglan@cisco.com>
Signed-off-by: Gregor Zatko <gzatko@cisco.com>