qemu: command: Unify values for boolean values when formating memory backends

QEMU's qapi visitor code allows yes/on/y for true and no/off/n for false
value of boolean properities. Unify the used style so that we can
generate it later and fix test cases.

src/qemu/qemu_command.c

@@ -4628,11 +4628,11 @@ qemuBuildMemoryBackendStr(unsigned long long size,
 
         switch (memAccess) {
         case VIR_MEM_ACCESS_SHARED:
-            virBufferAddLit(&buf, ",share=on");
+            virBufferAddLit(&buf, ",share=yes");
             break;
 
         case VIR_MEM_ACCESS_PRIVATE:
-            virBufferAddLit(&buf, ",share=off");
+            virBufferAddLit(&buf, ",share=no");
             break;
 
         case VIR_MEM_ACCESS_DEFAULT:

tests/qemuxml2argvdata/qemuxml2argv-hugepages-shared.args

@@ -4,11 +4,11 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
 mem-path=/dev/hugepages1G/libvirt/qemu,size=1024M,host-nodes=0-3,policy=bind \
 -numa node,nodeid=0,cpus=0,memdev=ram-node0 \
 -object memory-backend-file,id=ram-node1,prealloc=yes,\
-mem-path=/dev/hugepages2M/libvirt/qemu,share=on,size=1024M,host-nodes=0-3,\
+mem-path=/dev/hugepages2M/libvirt/qemu,share=yes,size=1024M,host-nodes=0-3,\
 policy=bind \
 -numa node,nodeid=1,cpus=1,memdev=ram-node1 \
 -object memory-backend-file,id=ram-node2,prealloc=yes,\
-mem-path=/dev/hugepages1G/libvirt/qemu,share=off,size=1024M,host-nodes=0-3,\
+mem-path=/dev/hugepages1G/libvirt/qemu,share=no,size=1024M,host-nodes=0-3,\
 policy=bind \
 -numa node,nodeid=2,cpus=2,memdev=ram-node2 \
 -object memory-backend-file,id=ram-node3,prealloc=yes,\