daemon: lvm2: Ignore "unknown device" output when a PV is missing (RHBZ#1054761).
tests: Add a regression test for RHBZ#1054761.
tests/regressions: Don't include binaries in EXTRA_DIST.

Because EXTRA_DIST simply used $(TESTS), and because the list of tests
includes C binaries, these were included in the tarball (actually not
binaries, but libtool scripts, but it's still undesirable).
Version 1.25.26.