CLI fail when alias name equals interface name

[chiourung]

What I did

Fix the CLI fail when set interface_naming_mode as alias and the alias name equal interface name

admin@as9516:~$ show int status Ethernet0,Ethernet8
  Interface                  Lanes    Speed    MTU    Oper FEC      Alias            Vlan    Oper    Admin    ProtoDown    Eff Admin    Type    Asym PFC    Oper Speed
-----------  ---------------------  -------  -----  ----------  ---------  --------------  ------  -------  -----------  -----------  ------  ----------  ------------
  Ethernet0        0,1,2,3,4,5,6,7     400G   9100          rs       Etp0  PortChannel500    down       up        False           up     N/A         N/A          400G
  Ethernet8  8,9,10,11,12,13,14,15     400G   9100          rs  Ethernet8  PortChannel500    down       up        False           up     N/A         N/A          400G 

admin@as9516:~$
admin@as9516:~$ sudo config interface_naming_mode alias
Please logout and log back in for changes take effect.
admin@as9516:~$ exit
...login...
admin@as9516:~$ show int status Etp0
  Interface            Lanes    Speed    MTU    Oper FEC    Alias            Vlan    Oper    Admin    ProtoDown    Eff Admin    Type    Asym PFC    Oper Speed
-----------  ---------------  -------  -----  ----------  -------  --------------  ------  -------  -----------  -----------  ------  ----------  ------------
  Ethernet0  0,1,2,3,4,5,6,7     400G   9100          rs     Etp0  PortChannel500    down       up        False           up     N/A         N/A          400G


admin@as9516:~$ show int status Ethernet8
Usage: show int status [OPTIONS] [INTERFACENAME]
Try "show int status -h" for help.

Error: cannot find interface name for alias Ethernet8 

How I did it

Create another API for interface_naming_mode to get interface name by alias name

How to verify it

admin@as9516-32d-2:~$ show interfaces status Ethernet8
  Interface      Lanes    Speed    MTU    Oper FEC      Alias    Vlan    Oper    Admin    ProtoDown    Eff Admin              Type    Asym PFC    Oper Speed
-----------  ---------  -------  -----  ----------  ---------  ------  ------  -------  -----------  -----------  ----------------  ----------  ------------
  Ethernet8  8,9,10,11     100G   9100          rs  Ethernet8   trunk      up       up        False           up  *QSFP28 or later         off          100G
admin@as9516-32d-2:~$ sudo config interface_naming_mode alias
Please logout and log back in for changes take effect.
admin@as9516-32d-2:~$ exit
...login...
admin@as9516-32d-2:~$ show int status Ethernet8
  Interface      Lanes    Speed    MTU    Oper FEC      Alias    Vlan    Oper    Admin    ProtoDown    Eff Admin              Type    Asym PFC    Oper Speed
-----------  ---------  -------  -----  ----------  ---------  ------  ------  -------  -----------  -----------  ----------------  ----------  ------------
  Ethernet8  8,9,10,11     100G   9100          rs  Ethernet8   trunk      up       up        False           up  *QSFP28 or later         off          100G

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)