Fix LUQueryInstances fields.

The query fields are now regular expressions. We need to quote the dots,
otherwise invalid fields will be accepted but they will lose special
formatting in the cli scripts.

Reviewed-by: imsnah

lib/cmdlib.py

@@ -3141,11 +3141,11 @@ class LUQueryInstances(NoHooksLU):
                                     "disk_template", "ip", "mac", "bridge",
                                     "sda_size", "sdb_size", "vcpus", "tags",
                                     "network_port", "beparams",
-                                    "(disk).(size)/([0-9]+)",
-                                    "(disk).(sizes)", "disk_usage",
-                                    "(nic).(mac|ip|bridge)/([0-9]+)",
-                                    "(nic).(macs|ips|bridges)",
-                                    "(disk|nic).(count)",
+                                    r"(disk)\.(size)/([0-9]+)",
+                                    r"(disk)\.(sizes)", "disk_usage",
+                                    r"(nic)\.(mac|ip|bridge)/([0-9]+)",
+                                    r"(nic)\.(macs|ips|bridges)",
+                                    r"(disk|nic)\.(count)",
                                     "serial_no", "hypervisor", "hvparams",] +
                                   ["hv/%s" % name
                                    for name in constants.HVS_PARAMETERS] +