fix

Author: LiliDeng

microsoft/testsuites/core/azure_image_standard.py

@@ -535,10 +535,10 @@ def verify_dhcp_file_configuration(self, node: Node) -> None:
         elif isinstance(node.os, CBLMariner):
             if node.os.information.version.major == 3:
                 dhcp_file_path = "/etc/dhcpcd.conf"
-                dhcp_file_content = 'option host_name'
+                dhcp_file_content = "option host_name"
             else:
                 dhcp_file_path = "/etc/dhcp/dhclient.conf"
-                dhcp_file_content = 'host-name'
+                dhcp_file_content = "host-name"
             file_exists = node.shell.exists(PurePosixPath(dhcp_file_path))
 
             assert_that(