rbd.cc: relicense as LGPL2

All past authors for rbd.cc have consented to relicensing from GPL to
LGPL2 via email:

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Date: Sat, 27 Jul 2013 01:59:36 +0200
From: Sylvain Munaut <s.munaut@whatever-company.com>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I hereby consent to the relicensing of any contribution I made to the
aforementioned rbd.cc file from GPL to LGPL2.1.

(I hope that'll be impressive enough, I did my best :p)

btw, tnt@246tNt.com and s.munaut@whatever-company.com are both me.

Cheers,

    Sylvain

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Date: Fri, 26 Jul 2013 17:00:48 -0700
From: Yehuda Sadeh <yehuda@inktank.com>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent.

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Date: Fri, 26 Jul 2013 17:02:24 -0700
From: Josh Durgin <josh.durgin@inktank.com>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent.

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Date: Fri, 26 Jul 2013 18:17:46 -0700
From: Stanislav Sedov <stas@freebsd.org>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent.

Thanks for taking care of it!

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Date: Fri, 26 Jul 2013 18:24:15 -0700
From: Colin McCabe <cmccabe@alumni.cmu.edu>

I consent.

cheers,
Colin

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Date: Sat, 27 Jul 2013 07:08:12 +0200
From: Christian Brunner <christian@brunner-muc.de>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent

Christian

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Date: Sat, 27 Jul 2013 12:17:34 +0300
From: Stratos Psomadakis <psomas@grnet.gr>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

Hi,

I consent with the GPL -> LGL2.1 re-licensing.

Thanks
Stratos

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Date: Sat, 27 Jul 2013 16:13:13 +0200
From: Wido den Hollander <wido@42on.com>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent!

You have my permission to re-license the code I wrote for rbd.cc to LGPL2.1

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Date: Sun, 11 Aug 2013 10:40:32 +0200
From: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
Subject: Re: btw

Hi Sage,

I agree to switch the license of ceph_argparse.py and rbd.cc from GPL2
to LGPL2.

Regards

Danny Al-Gaaf

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Date: Tue, 13 Aug 2013 17:15:24 -0700
From: Dan Mick <dan.mick@inktank.com>
Subject: Re: Ceph rbd.cc GPL -> LGPL2 license change

I consent to relicense any contributed code that I wrote under LGPL2.1 license.

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...and I consent too.  Drop the exception from COPYING and debian/copyright
files.

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 2206f55761c675b31078dea4e7dd66f2666d7d03)