Interpret some special characters for label markup, such as &, <, >, etc.
Otherwise, the message dialog can't show them, and worsely, it makes the
whole message blank.
[Yocto #2492]
(Bitbake rev: fb82f6eb5405274f702bd6d64cbe995fd4b74145)
Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>