op-mode: T5633, T6465: fix error when op cmd interrupted, updates some system call syntax

[Giggum]

Change Summary

• Add exception catching for broken pipe error to exit gracefully when user stops program output. Resolves T5633: Bug 1 and 3
• Corrects syntax for invoked "show ipv6 route bgp" command
• Updates syntax for invoked show system image version / show system image storage to new CLI syntax

Note: Bug 2 identified in T5633 is non-breaking but has not been solved in this PR. I've narrowed the issue down to the underlying vyatta-op-cmd-wrapper shell code. I'm proposing to open a new Maniphest ticket specifically on this bug and close T5633 when PR is merged that way it's separated from this work and still visible as a bug to be fixed in the future.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T5633 bugs 1 and 3
https://vyos.dev/T6465

Related PR(s)

Component(s) name

Proposed changes

How to test

Smoketest result

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[Giggum]

Before
Pressing 'q' to exit during op-command output yielded a BrokenPipeError. This issue affects VyOS 1.4 as well see output below:

vyos@vyos:~$ sh tech-support report

--------------------------------
VyOS Version and Package Changes
--------------------------------
Version:          VyOS 1.5-rolling-202310021845
Release train:    current

Built by:         autobuild@vyos.net
Built on:         Mon 02 Oct 2023 20:06 UTC
Build UUID:       51c6bd24-f741-4df2-8dc2-053ffa2e992c
Build commit ID:  86f80f99c57240

Architecture:     x86_64
Boot via:         installed image
System type:      KVM guest

Hardware vendor:  QEMU
Hardware model:   Standard PC (i440FX + PIIX, 1996)
Hardware S/N:
Hardware UUID:    b78d1414-6c0b-485c-b20a-7418cf5668c7

Copyright:        VyOS maintainers and contributors

Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf>
BrokenPipeError: [Errno 32] Broken pipe


vyos@vyos:~$ show tech-support report

--------------------------------
VyOS Version and Package Changes
--------------------------------
Version:          VyOS 1.4.0
Release train:    sagitta
Release flavor:   generic

Built by:         Sentrium S.L.
Built on:         Tue 04 Jun 2024 09:23 UTC
Build UUID:       5e6ae0c4-4d17-4b69-9247-b4ba44a3e3c2
Build commit ID:  35dd8ae6522c78-dirty

Architecture:     x86_64
Boot via:         installed image
System type:      bare metal

Hardware vendor:  Dell Inc.
Hardware model:   OptiPlex 3060
Hardware S/N:     (redacted)
Hardware UUID:    (redacted)

Copyright:        VyOS maintainers and contributors

------------------
Configuration file
------------------
container {
    name adguardhome {
        allow-host-networks
        capability "net-bind-service"
        image "docker.io/adguard/adguardhome:latest"
        restart "always"
        volume adguardhome-conf {
            destination "/opt/adguardhome/conf"
qException ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>
BrokenPipeError: [Errno 32] Broken pipe
vyos@vyos:~$ q

After
No error when 'q' pressed to exit running of op-command

vyos@vyos:~$ show tech-support report

--------------------------------
VyOS Version and Package Changes
--------------------------------
Version:          VyOS 1.5-rolling-202406060020
Release train:    current
Release flavor:   generic

Built by:         autobuild@vyos.net
Built on:         Thu 06 Jun 2024 03:11 UTC
Build UUID:       e0cb746f-5572-4aaf-8d6c-536ac82e5957
Build commit ID:  9c2ec5e3d31713

Architecture:     x86_64
Boot via:         installed image
System type:      QEMU guest

Hardware vendor:  QEMU
Hardware model:   Standard PC (Q35 + ICH9, 2009)
Hardware S/N:     
Hardware UUID:    b165d52d-5db7-4edb-990a-09d083799a23

Copyright:        VyOS maintainers and contributors

------------------
Configuration file
------------------
interfaces {
    ethernet eth0 {
        address "dhcp"
        address "2001:db8:3456::1/48"
        mtu "1492"
        offload {
            gro
            gso
vyos@vyos:~$ 

[github-actions]

❌ VyOS CLI smoketests failed!