Mms: Filter illegal character in address.

Add filter to verify recipient character when sending message.
If all recipients are legal, send it.
If some recipients are illegal, warn it and can be sended.
If all recipients are illegal, do not send the message.

Change-Id: I504beeff0bc9b9b33ff266759d74f204387b36f0
Signed-off-by: Xiaojing Zhang <zhangx@codeaurora.org>