Add j2 template for enable pam_limit and limit SSH session

[liuh-80]

Why I did it

When too many user login concurrently and run commands, SONiC may kernel panic on some device which has very limited memory.

How I did it

Add j2 template for setup pam_limit plugin for limit SSH session per-user.

How to verify it

Manually validate the j2 template can generate correct config file.

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

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

Description for the changelog

Add j2 template for setup pam_limit plugin for limit SSH session per-user.

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

[qiluo-msft]

I will check after merging #10177

[liuh-80]

The behavior been tested by following steps:

1. Update the config template to match device HWSKU and device type to limit SSH session to 4.
2. When user try to make more than 4 ssh connection, the connection will be reject and user will get a alert message.