data parsers BUGFIX allow repeted resolving of leafrefs
data parsers BUGFIX allow repeted resolving of leafrefs

In case the leafref path depends on value from another leafref, it
might be necessary to resolve the leafrefs repeatedly (similarly as
when conditions are).

Fixes #287

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