cls_rgw_types: fixup previous commit encoding issues

Don't use the packed_val stuff, because it's somehow broken. Bump
the min compatible version in rgw_bucket_dir_entry encoding, because
we're changing the data in the middle of the encoding. And set the
ver.pool value to -1 (so that it matches the constructor) when
decoding old-format encodings.

Signed-off-by: Greg Farnum <greg@inktank.com>
cls_rgw: bucket index versioning

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
Signed-off-by: Greg Farnum <greg@inktank.com>

Conflicts:

	src/cls/rgw/cls_rgw_types.h
cls_rgw_types: fixup previous commit to not use packed_val encoding

It's broken.

Signed-off-by: Greg Farnum <greg@inktank.com>
radosgw-admin, cls_rgw: list bucket index log

a new radosgw-admin command to list bucket index log.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
cls_rgw_types: remove the packed_val encoding system

It was broken, so we aren't using it anyway.

Signed-off-by: Greg Farnum <greg@inktank.com>
radosgw-admin: bilog list gets marker and max-entries params

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>