Add Command sonic-clear logging

[matiAlfaro]

What I did

Added command
sonic-clear logging - delete syslog & syslog.1
sonic-clear logging -a/--all - delete syslog* files

How I did it

Equivalent to "show logging" command, working on files at /var/log or at /var/log.tmpfs
delete relevant syslog* files

How to verify it

1. clear logging when no syslog files exist
2. clear logging when only syslog file exist
3. clear logging when syslog & syslog.1 files exits
4. clear logging when syslog, syslog.1 and syslog2.gz files exits

Repeat 1-4 with
Clear logging --all

verify also that show logging behave correctly after clear

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

NR

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

none

[shiraez]

Looks good,
But it can be problematic if this PR merges:
sonic-net#3132

[matiAlfaro]

I think that one is already part of master, I'll have another look.
Was also thinking to clear the files instead of deleting them

[VladimirKuk]

1. There are /var/log/syslog.X directories (where X is running number) which also contain some older log files.
2. Also, maybe we should add age parameter to delete "older than" files instead of deleting all of them.

[shiraez]

BTW it looks like they added a test to the show logging

[amazor]

What Python version is used in SONiC?

[matiAlfaro]

What Python version is used in SONiC?

Not sure if correct for all platform/builds, but VS (master) runs 3.11.2
RD-AC5X (master) runs 3.9.2

[amazor]

Looks good to me

[matiAlfaro]

BTW it looks like they added a test to the show logging

don't know if needed, don't think it's worth the effort, but if mandatory ...