task/kernel: don't fail if we're confused by grub
task/kernel: don't fail if we're confused by grub

If we don't have menuitem in the grub conf, and we dn't see /boot/loader/entries
file, just don't do grub2-set-default at all and hope for the best.  Worst
case we'll fail later because we didn't boot the right kernel.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@redhat.com>

dmick/teuthology,SUSE/teuthology,ceph/teuthology,ktdreyer/teuthology,dmick/teuthology,ktdreyer/teuthology,ceph/teuthology,dmick/teuthology,SUSE/teuthology,SUSE/teuthology