ceph-objectstore-tool: Additional OSDMap handling

Fail import if import data doesn't include OSDMap and can't find it locally
See if local map can be read for import's epoch
Jump to current epoch like a split would if local map not present

Signed-off-by: David Zafman <dzafman@redhat.com>
ceph_objectstore_tool: validate pgid before calling PG::_has_removal_flag()

The "meta" directory could be removed when trying to removing pgid 0.0

Signed-off-by: David Zafman <dzafman@redhat.com>