[docker-lldp] Fix lldpcli issue when description has special characte…

…rs (sonic-net#4133)

Before the fix:
lldpcli configure ports Ethernet96 lldp portidsubtype local 'Eth1/1' description 50G|sonic1|Eth1/3/2
bash: sonic1: command not found
bash: Eth1/3/2: No such file or directory

After fix:
lldpcli configure ports Ethernet96 lldp portidsubtype local 'Eth1/1' description '50G|sonic1|Eth1/3/2'
run successfully.

Signed-off-by: Zhenggen Xu <zxu@linkedin.com>

dockers/docker-lldp-sv2/lldpmgrd

@@ -153,7 +153,7 @@ class LldpManager(object):
 
         # if there is a description available, also configure that
         if port_desc:
-            lldpcli_cmd += " description {}".format(port_desc)
+            lldpcli_cmd += " description '{}'".format(port_desc)
         else:
             log_info("Unable to retrieve description for port '{}'. Not adding port description".format(port_name))