vz: get additional error information from job correctly
vz: get additional error information from job correctly

First, make function logPrlEventErrorHelper be void and only
print information (if any) from an event.
Second, don't rewrite original error with any errors we get
during parsing event info.
Third, ignore PRL_ERR_NO_DATA at all.

Signed-off-by: Maxim Nestratov <3521c777060d1ad4ae08bba7eb9d80264eaeb236@virtuozzo.com>

nertpinx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,taget/libvirt,libvirt/libvirt,taget/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,crobinso/libvirt,fabianfreyer/libvirt,zippy2/libvirt,crobinso/libvirt,eskultety/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,taget/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,taget/libvirt,datto/libvirt,libvirt/libvirt,datto/libvirt,VenkatDatta/libvirt,crobinso/libvirt,VenkatDatta/libvirt,eskultety/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,datto/libvirt,crobinso/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,eskultety/libvirt,taget/libvirt,olafhering/libvirt,olafhering/libvirt,jardasgit/libvirt,eskultety/libvirt,jardasgit/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,datto/libvirt,nertpinx/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,datto/libvirt,olafhering/libvirt,nertpinx/libvirt