qemu.tests.cdrom: Rename get_cdrom_device

Rename this function to get_empty_cdrom_device, to make its name
match what it does.
Signed-off-by: NQingtang Zhou <qzhou@redhat.com>

qemu/tests/cdrom.py

@@ -239,8 +239,10 @@ def run_cdrom(test, params, env):
         return pid.group(1)
 
 
-    def get_cdrom_device(vm):
-        """Get cdrom device when cdrom is not insert."""
+    def get_empty_cdrom_device(vm):
+        """
+        Get cdrom device when cdrom is not insert.
+        """
         device = None
         blocks = vm.monitor.info("block")
         if isinstance(blocks, str):
@@ -298,7 +300,7 @@ def run_cdrom(test, params, env):
             logging.debug("cdrom_dev_list: %s", cdrom_dev_list)
             if params.get('not_insert_at_start') == "yes":
                 error.context("Locked without media present", logging.info)
-                device = get_cdrom_device()
+                device = get_empty_cdrom_device()
                 cdrom_dev = cdrom_dev_list[0]
                 if vm.check_block_locked(device):
                     raise error.TestFail("Device should not be locked just after "