test: use modern qemu numa arguments

Upgrading to qemu 5.2 breaks TEST-36-NUMAPOLICY like:
  qemu-system-x86_64: total memory for NUMA nodes (0x0) should
  equal RAM size (0x20000000)

Use the new (as in >=2014) form of memdev in test 36:
 -object memory-backend-ram,id=mem0,size=512M -numa node,memdev=mem0,nodeid=0

Since some target systems are as old as qemu 1.5.3 (CentOS7) but the new
kind to specify was added in qemu 2.1 this needs to add version parsing and
add the argument only when qemu is >=5.2.

Fixes #17986.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

test/TEST-36-NUMAPOLICY/test.sh

@@ -3,7 +3,11 @@ set -e
 
 TEST_DESCRIPTION="test MUMAPolicy= and NUMAMask= options"
 TEST_NO_NSPAWN=1
-QEMU_OPTIONS="-numa node,nodeid=0"
 . $TEST_BASE_DIR/test-functions
+if qemu_min_version "5.2.0"; then
+    QEMU_OPTIONS="-object memory-backend-ram,id=mem0,size=512M -numa node,memdev=mem0,nodeid=0"
+else
+    QEMU_OPTIONS="-numa node,nodeid=0"
+fi
 
 do_test "$@" 36

test/test-functions

@@ -227,6 +227,24 @@ function find_qemu_bin() {
     fi
 }
 
+# Compares argument #1=X.Y.Z (X&Y&Z = numeric) to the version of the installed qemu
+# returns 0 if newer or equal
+# returns 1 if older
+# returns 2 if failing
+function qemu_min_version() {
+    find_qemu_bin || return 2
+
+    # get version from binary
+    qemu_ver=$($QEMU_BIN --version | awk '/^QEMU emulator version ([0-9]*\.[0-9]*\.[0-9]*) / {print $4}')
+
+    # Check version string format
+    echo "$qemu_ver" | grep -q '^[0-9]*\.[0-9]*\.[0-9]*$' || return 2
+    echo "$1" | grep -q '^[0-9]*\.[0-9]*\.[0-9]*$' || return 2
+
+    # compare as last command to return that value
+    printf "%s\n%s\n" "$1" "$qemu_ver" | sort -V -C
+}
+
 # Return 0 if QEMU did run (then you must check the result state/logs for actual
 # success), or 1 if QEMU is not available.
 run_qemu() {