Bug 2191: Invalid use of addType in ChoiceCaseBuilder
1) in CoppyUtils removed from method copy functionality about copying
typedefs and grouping from old ChoiceCaseBuilder, which throw in
this implementation YangParseException
2) in AbstractDocumentedDataNodeContainerBuilder removed final modifier
from method addGrouping because this method must be overriden in
ChoiceCaseBuilder to throw YangParseException
3) in ChoiceCaseBuilder were overriden addGrouping method to throw
YangParseException becaouse by RFC 6020 is not allowed that
choice case has grouping
Change-Id: Ic06524f3489a36c73f07c8b44701895dc0e9896e
Signed-off-by: Ladislav Borak <lborak@cisco.com>