Add support for gNOI File Remove

[jkmar]

Why I did it

Add support for gNOI File Remove

How I did it

Implement support for gNOI File Remove using the translib from sonic-mgmt-common.
Other PRs:

• sonic-mgmt-common: Add support for gNOI File Remove sonic-mgmt-common#167
• sonic-host-services: Add support for gNOI File Remove sonic-host-services#248

How to verify it

Tested on a physical switch:

cisco@sonic:~$ touch /tmp/test_remove
cisco@sonic:~$ docker exec -it gnmi gnoi_client -notls -insecure -module File -rpc Remove -jsonin '{"remote_file":"/tmp/test_remove"}'
File Remove
{}
cisco@sonic:~$ ls -l /tmp/test_remove
ls: cannot access '/tmp/test_remove': No such file or directory
cisco@sonic:~$ docker exec -it gnmi gnoi_client -notls -insecure -module File -rpc Remove -jsonin '{"remote_file":"/tmp/test_remove"}'
File Remove
panic: rpc error: code = Unknown desc = [Errno 2] No such file or directory: dbus.String('/tmp/test_remove')

goroutine 1 [running]:
github.com/sonic-net/sonic-gnmi/gnoi_client/file.Remove(0xc000226c08, {0xbc6eb0, 0xc0001aac30})
        /sonic/src/sonic-gnmi/gnoi_client/file/file.go:45 +0x1a5
main.main()
        /sonic/src/sonic-gnmi/gnoi_client/gnoi_client.go:54 +0x245

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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[jkmar]

Please review @kwangsuk @anand-kumar-subramanian @mbalachandar @amrutasali @sachinholla @sneelam20

[jkmar]

Already done by #385