Support for Amazon Linux 2 (2017.12)

[mtunstill]

This mini utility to change elements of Amazon Linux is perfect for Packer bootstrapping to create a custom AMI without configuration management tools.

Although there are some major changes in Amazon Linux 2, this utility can still cover most of the changes without much alteration. On an initial run (against the latest Amazon Linux 2 AMI - amzn2-ami-hvm-2017.12.0.20180509-x86_64-*), these things broke...

• Chrony service would not enable (removal of init.d in Amazon Linux 2)
• Applying the fstab configuration would break the new AMI from bootstrapping (root locked error message)

[I have a solution to allow this python application to work for Amazon Linux 2 - I'll generate a diff against my fork and create a pull request]

[mtunstill]

I've created a pull request here that includes these changes...

#10

[nozaq]

@mtunstill
Thank you for fixing issues on Amazon Linux 2 (and a typo as well :p)! I'll check if these changes are compatible on both Amazon Linux 1 & 2.

As you mentioned, Amazon Linux 2 introduced a lot of changes including systemd support. I'm gonna spend some time for complete support.

[mtunstill]

The fixes might not be 100%, but it gets it through. I'm very likely to be contributing to this repo as this is great for setups without a config management tool.

[chrissward]

Is there any update on this issue since this seems to be a great little util if it is made compatible for AL2..