yin parser BUGFIX (not)manadatory substatements in type
yin parser BUGFIX (not)manadatory substatements in type

When type is not directly derived from a built-in types, the mandatory
substatements such as path or base are actually not mandatory since they
are already defined in types from which the current type is being derived.

PavolVican/libyang,PavolVican/libyang,lukasmacko/libyang,PavolVican/libyang,lukasmacko/libyang,PavolVican/libyang,PavolVican/libyang