[connect][clear] Support --devicename option for connect/clear line commands

[Blueve]

- What I did
Support --devicename and -d option for sonic-clear/connect line commands

- How I did it
Add missing options.

- How to verify it
Tested on physical SONiC DUT with below initial configuration.

admin@sonic:~$ sudo show line -b
  Line    Baud    PID    Start Time    Device
------  ------  -----  ------------  --------
     1    9600      -             -   switch1

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

admin@sonic:~$ sudo connect line --devicename switch1
Usage: connect line [OPTIONS] LINENUM
Try "connect line -h" for help.

Error: no such option: --devicename
admin@sonic:~$ sonic-clear line --devicename switch1
Usage: sonic-clear line [OPTIONS] LINENUM
Try "sonic-clear line -h" for help.

Error: no such option: --devicename

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

admin@sonic:~$ sudo connect line --devicename switch1
Successful connection to line 1
Press ^A ^X to disconnect


admin@sonic:~$ sudo sonic-clear line --devicename switch1
admin@sonic:~$ sudo show line -b
  Line    Baud    PID    Start Time    Device
------  ------  -----  ------------  --------
     1    9600      -             -   switch1

[lguohan]

i think we need to add the doc for this command line change.

[jleveque]

Please document the new --devicename option for both clear and connect in the CommandReference document.

[Blueve]

@lguohan @jleveque I updated the documents, I found that there are no clear/connect commands documents although we have those commands.

• Add document for show line and move it to console section
• Add document for config console ...
• Add document for connect/clear line

doc added