savevm: create snapshot failed when id_str already exists

The command "virsh create" will fail in such condition: vm has two
disks: vda and vdb. vda has snapshot s1 with id "1", vdb doesn't have
s1 but has snapshot s2 with id "1".  When we want to run command "virsh
create s1", del_existing_snapshots() only deletes s1 in vda, and
bdrv_snapshot_create() tries to create vdb's snapshot s1 with id "1",
but id "1" alreay exists in vdb with name "s2"!

The simplest way is call find_new_snapshot_id() unconditionally.

Signed-off-by: Yi Wang <up2wing@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

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