fixing keepalived dependency for offline installation(NIM)

[bejjrajesh]

Proposed changes

Problem: NIM 2.19.0 introduced a dependency on keepalived. For online installations, this dependency is getting auto resolved and installed. But offline installations are not packaging keepalived and it's dependencies in the final tar.gz archive file.

Solution: This MR contains the changes to include keepalived and it's dependencies in the zip archive created in the offline mode installation.

Testing: Manual testing performed on ubuntu and rpm based systems.

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If this PR addresses an issue on GitHub, ensure that you link to it here:

Closes #ISSUE

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[mjang]

I'm going to push minor text changes to the messages shown to users, and will then merge.

[mjang]

@bejjrajesh One comment -- I see you used "please" when telling the user to install Docker. In most cases, we wouldn't use "please," as it's sort of a waste of space.

But in this particular case, it's appropriate. Nice work! Per Google guidelines (material.io is essentially a Google style guide),

However, "please" may be used when asking the user to do something inconvenient.