MAINTAINERS: update an e-mail address
MAINTAINERS: update an e-mail address

I no longer have direct access to my Inktank e-mail.  I still pay
attention to rbd, so update its entry in MAINTAINERS accordingly.

Signed-off-by: Alex Elder <f429030cf5c0faf36fac3d102073b6e63a647baa@linaro.org>
Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@inktank.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs