virt-xml: fix a terminal_width depends issue

One of virt-xml test case will output logs by
urlgrabber.process, which will get the real width of
terminals.
If we resize terminal, of who is running test, from
80 to other size, test case will fail.
This patch will screen it when running test case.

Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>

tests/__init__.py

@@ -22,6 +22,7 @@ import os
 
 os.environ["VIRTINST_TEST_TRACKPROPS"] = "1"
 os.environ["VIRTINST_TEST_SUITE"] = "1"
+os.environ["VIRTINST_TEST_CLI_VIRTXML"] = "1"
 
 import virtinst
 virtinst.stable_defaults = False

tests/cli-test-xml/compare/virtxml-add-disk-create-storage.xml

@@ -8,7 +8,5 @@
    </devices>
  </domain>
 
-
-Creating storage file __virtinst_cli_new1.img            |  10 MB     00:00     
 Domain 'test-many-devices' defined successfully.
 Changes will take effect after the next domain shutdown.

virt-xml

@@ -240,9 +240,13 @@ def setup_device(dev):
         return
 
     logging.debug("Doing setup for disk=%s", dev)
-    meter = (cli.quiet and
-             progress.BaseMeter() or
-             progress.TextMeter(fo=sys.stdout))
+
+    if "VIRTINST_TEST_CLI_VIRTXML" in os.environ:
+        meter = progress.BaseMeter()
+    else:
+        meter = (cli.quiet and
+                 progress.BaseMeter() or
+                 progress.TextMeter(fo=sys.stdout))
 
     dev.setup(meter)
     dev.virt_xml_setup = True