api: add VIR_DOMAIN_UNDEFINE_KEEP_NVRAM flag
api: add VIR_DOMAIN_UNDEFINE_KEEP_NVRAM flag

This flags specifies to keep nvram file if it is existed for inactive
domains.

Signed-off-by: Nikolay Shirokovskiy <7fa0e2698a05be944b362bdf5d7736c0162e16c9@virtuozzo.com>

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