tests: add test case for new syntax of VNC unix path with '='

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket-new-cmdline.args

+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-M pc \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-usb \
+-vnc vnc=unix:/tmp/foo=bar.sock \
+-vga cirrus

tests/qemuxml2argvdata/qemuxml2argv-graphics-vnc-socket-new-cmdline.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+  </os>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <graphics type='vnc'>
+      <listen type='socket' socket='/tmp/foo=bar.sock'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='16384' heads='1'/>
+    </video>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1058,6 +1058,8 @@ mymain(void)
     DO_TEST("graphics-vnc-auto-socket", QEMU_CAPS_VNC,
             QEMU_CAPS_DEVICE_CIRRUS_VGA);
     DO_TEST("graphics-vnc-none", QEMU_CAPS_VNC, QEMU_CAPS_DEVICE_CIRRUS_VGA);
+    DO_TEST("graphics-vnc-socket-new-cmdline", QEMU_CAPS_VNC,
+            QEMU_CAPS_DEVICE_CIRRUS_VGA, QEMU_CAPS_VNC_MULTI_SERVERS);
 
     driver.config->vncSASL = 1;
     VIR_FREE(driver.config->vncSASLdir);