[CEXEC] Code clean up; Add resolv.conf fixing in chroot:

[jacobweinstock]

Description

Cleaning up the code base for improved maintainability. Add option to use the host's /etc/resolv.conf in the chroot env. This resolves issues with DNS based network calls for things like package managers, etc.

Why is this needed

Fixes: #92

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• [ ] updated the documentation and/or roadmap (if required)
• [ ] added unit or e2e tests
• [ ] provided instructions on how to upgrade

[jacobweinstock]

Thanks for the review, @chrisdoherty4 !