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We need a backport of libnl: >>route/link: return -NLE_OPNOTSUPP in rtnl_link_get_kernel() for old kernels<< (http://git.infradead.org/users/tgr/libnl.git/commitdiff/b54775d3169b56d9c0aee47d6937b0358a5443e0)

Reason:
Better old kernel handling in VDSM.

Patches backported and present in rhel-6.8 build libnl3-3.2.21-8.el6


Note that the corresponding patches are not in RHEL-7, because:

  - on RHEL-7, the situation cannot really arise, because there kernel
    supports lookup by name (thus the error-code would not be returned there).
  - for RHEL-7.3 we will rebase libnl3 to a new upstream version (thus the fix
    will come that way).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-0811.html