tests: delete most qemu-img test cases assuming FMT_OPTIONS

We have two leftover "capabilites" for qemu-img:
QEMU_IMG_BACKING_FORMAT_OPTIONS
QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT

The former says we are able to specify the backing format via -o
(which has been the case for a long time now) and the second one
says we can use -o compat to specify the qcow2 version.

Since we require QEMU 1.5.0, we can always assume -o compat,
which was introduced in QEMU 1.1.

Drop the test cases using FMT_OPTIONS which have a FMT_COMPAT
counterpart to prepare for deprecating FMT_OPTIONS (and these flags)
completely.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

tests/storagevolxml2argvdata/qcow2-convert-nobacking.argv

-qemu-img convert -f raw -O qcow2 -o encryption=on \
-/var/lib/libvirt/images/sparse.img /var/lib/libvirt/images/OtherDemo.img

tests/storagevolxml2argvdata/qcow2-from-logical.argv

-qemu-img convert -f raw -O qcow2 -o encryption=on /dev/HostVG/Swap \
-/var/lib/libvirt/images/OtherDemo.img

tests/storagevolxml2argvdata/qcow2-nobacking-convert-prealloc.argv

-qemu-img convert -f raw -O qcow2 -o encryption=on,preallocation=metadata \
-/var/lib/libvirt/images/sparse.img /var/lib/libvirt/images/OtherDemo.img

tests/storagevolxml2argvdata/qcow2-nobacking-prealloc.argv

-qemu-img create -f qcow2 -o encryption=on,preallocation=metadata \
-/var/lib/libvirt/images/OtherDemo.img 5242880K

tests/storagevolxml2argvdata/qcow2.argv

-qemu-img create -f qcow2 -b /dev/null -o backing_fmt=raw,encryption=on \
-/var/lib/libvirt/images/OtherDemo.img 5242880K

tests/storagevolxml2argvtest.c

@@ -196,40 +196,6 @@ mymain(void)
 #define DO_TEST_FAIL(pool, ...) \
     DO_TEST_FULL(true, 0, pool, __VA_ARGS__)
 
-    DO_TEST("pool-dir", "vol-qcow2",
-            NULL, NULL,
-            "qcow2", 0, FMT_OPTIONS);
-    DO_TEST_FAIL("pool-dir", "vol-qcow2",
-                 NULL, NULL,
-                 "qcow2-prealloc", flags, FMT_OPTIONS);
-    DO_TEST("pool-dir", "vol-qcow2-nobacking",
-            NULL, NULL,
-            "qcow2-nobacking-prealloc", flags, FMT_OPTIONS);
-    DO_TEST("pool-dir", "vol-qcow2-nobacking",
-            "pool-dir", "vol-file",
-            "qcow2-nobacking-convert-prealloc", flags, FMT_OPTIONS);
-    DO_TEST_FAIL("pool-dir", "vol-qcow2",
-                 "pool-dir", "vol-file",
-                 "qcow2-convert-nobacking", 0, FMT_OPTIONS);
-    DO_TEST_FAIL("pool-dir", "vol-qcow2",
-                 "pool-dir", "vol-file",
-                 "qcow2-convert-prealloc", flags, FMT_OPTIONS);
-    DO_TEST("pool-dir", "vol-qcow2-lazy",
-            NULL, NULL,
-            "qcow2-lazy", 0, FMT_OPTIONS);
-    DO_TEST("pool-dir", "vol-qcow2-1.1",
-            NULL, NULL,
-            "qcow2-1.1", 0, FMT_OPTIONS);
-    DO_TEST_FAIL("pool-dir", "vol-qcow2-0.10-lazy",
-                 NULL, NULL,
-                 "qcow2-0.10-lazy", 0, FMT_OPTIONS);
-    DO_TEST("pool-dir", "vol-qcow2-nobacking",
-            "pool-logical", "vol-logical",
-            "qcow2-from-logical", 0, FMT_OPTIONS);
-    DO_TEST("pool-logical", "vol-logical",
-            "pool-dir", "vol-qcow2-nobacking",
-            "logical-from-qcow2", 0, FMT_OPTIONS);
-
     DO_TEST("pool-dir", "vol-qcow2",
             NULL, NULL,
             "qcow2-compat", 0, FMT_COMPAT);
@@ -254,9 +220,6 @@ mymain(void)
     DO_TEST("pool-logical", "vol-logical",
             "pool-dir", "vol-qcow2-nobacking",
             "logical-from-qcow2", 0, FMT_COMPAT);
-    DO_TEST("pool-dir", "vol-qcow2-nocow",
-            NULL, NULL,
-            "qcow2-nocow", 0, FMT_OPTIONS);
     DO_TEST("pool-dir", "vol-qcow2-nocow",
             NULL, NULL,
             "qcow2-nocow-compat", 0, FMT_COMPAT);