improve some functions in qemu-option.c

Improve opt_get and opt_set group of functions. For opt_get, check and handle
NULL input; for opt_set, when set to an existing option, rewrite the option
with new value.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
improve assertion in qemu_opt_get functions

In qemu_opt_set functions, if desc doen't exist but opts_accepts_any is true, it
won't report error, but can still alloc an opt for the option and save it.
However, after that, when doing qemu_opt_get, this option could be found in opts
but opt->desc is NULL. This is correct, should not be treated as error.

This patch would fix vvfat issue after changing to QemuOpts.

Signed-off-by: Chunyan Liu <cyliu@suse.com>
add some QemuOpts functions for replace work

Add some qemu_opt functions to replace the same functionality of
QEMUOptionParameter handling.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
add convert functions between QEMUOptionParameter to QemuOpts

Add two temp convert functions between QEMUOptionParameter to QemuOpts, so that
next patch can use it. It will simplify next patch for easier review.

Signed-off-by: Chunyan Liu <cyliu@suse.com>
change block layer to support both QemuOpts and QEMUOptionParamter

Change block layer to support both QemuOpts and QEMUOptionParameter.
After this patch, it will change backend drivers one by one. At the end,
QEMUOptionParameter will be removed and only QemuOpts is kept.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
cow.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
gluster.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
iscsi.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
qcow.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
qcow2.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
qed.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
raw-posix.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
raw-win32.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
raw_bsd.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
rbd.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
sheepdog.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
ssh.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
vdi.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
vmdk.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>
vpc.c: replace QEMUOptionParameter with QemuOpts

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Chunyan Liu <cyliu@suse.com>