…or DualToR config (sonic-net#82)

This PR is a required for changing the L3 IP forwarding Behavior to SoC in active-active toplogy.
Basically a src IP is added to the SNAT rule so that only packets originating from ToR with src IP as vlan IP get natted by the rule and change the src IP to LoopBack IP
However if there are mutiple vlan IP's we only add the source IP as vlan IP, for which the SoC IP belongs to, this PR adds that change.

How I did it
check the config DB if the ToR is a DualToR and has an SoC IP assigned.
put an iptable rule
iptables -t nat -A POSTROUTING --destination -j SNAT --to-source "

Signed-off-by: vaibhav-dahiya <[email protected]>

Newer versions of pip/setuptools don't support test_requires, and the
current standard is to specify any extra dependencies (such as those
required for testing) under extra_requires.

Therefore, specify the testing dependencies under extra_requires. These
can be installed via pip using `pip install '.[testing]'`.

Signed-off-by: Saikrishna Arcot <[email protected]>

Signed-off-by: Saikrishna Arcot <[email protected]>

Debian Bookworm has removed libpam-cracklib; replace with
libpam-pwquality.

Signed-off-by: Saikrishna Arcot <[email protected]>

This repo's tests depends on files that are in
src/sonic-host-services-data in sonic-buildimage. Due to PR check
requirements, this creates a cyclical dependency when needing to update
the templates and the sample output files.

To fix that cyclical dependency, move that directory into this repo.
That way, both the templates and the sample output files can be updated
in a single commit.

Signed-off-by: Saikrishna Arcot <[email protected]>