qemu-char: remove use of QEMUTimer in favor of glib idle function

qemu-char is now independent of the QEMU main loop.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Message-id: 3cda0bbcfb94912df8a767983a52bb71a4a3231d.1362505276.git.amit.shah@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
