cephadm: add ability to continue on failure when applying multiple specs

cephadm: add ability to continue on failure when applying multiple specs

Additionally, add the flag that does so when cephadm applies
a spec during bootstrap. Bootstrap will continue to completion
regardless of whether applying the spec fails, so we might
as well try applying all of it while reporting errors we
do see back to the user

Fixes: https://tracker.ceph.com/issues/65338
Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit 12a9aba43caedf6ea2cb897708e0b31d96ee358f)