gplazma-nis: pulgin must fail if no matching principal found

Acked-by: Paul Millar
Target: master, 2.9
Require-book: no
Require-notes: no
(cherry picked from commit 3c6da5111544709105f5adbb3d6dbf4d38de988f)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>