Merge branch 'master' of git://git.qemu.org/qemu
Merge branch 'master' of git://git.qemu.org/qemu
Merge branch 'master' of git://git.qemu.org/qemu
Merge branch 'master' of git://git.qemu.org/qemu
Merge branch 'master' of git://git.qemu.org/qemu
add def_value_str and use it in qemu_opts_print

qemu_opts_print has no user now, so can re-write the function safely.

qemu_opts_print will be used while using "qemu-img create", it will
produce the same output as previous code.

The behavior of this function has changed:

1. Print every possible option, whether a value has been set or not.
2. Option descriptors may provide a default value.
3. Print to stdout instead of stderr.

Previously the behavior was to print every option that has been set.
Options that have not been set would be skipped.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
v12 : 0001
Create four opts list related functions

This patch will create 4 functions, count_opts_list, append_opts_list,
free_opts_list and print_opts_list, they will used in following commits.

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