Add Services Support for EKS and EMR

[bwagner5]

Issue #, if available:
#68

Description of changes:

TL;DR:

This PR adds support for arbitrary service filtering based on a simple service interface which transforms the user supplied filters (just like the aggregate filter functionality). This PR adds two implementations of services for EMR and EKS w/ versioning.

Example CLI usage:

$ ec2-instance-selector --service eks --max-results 5
a1.2xlarge
a1.4xlarge
a1.large
a1.medium
a1.metal
NOTE: 374 entries were truncated, increase --max-results to see more

$ ec2-instance-selector --service eks-20210125 --max-results 5
a1.2xlarge
a1.4xlarge
a1.large
a1.medium
a1.metal
NOTE: 374 entries were truncated, increase --max-results to see more

$ ec2-instance-selector --service emr --max-results 5
c1.medium
c1.xlarge
c3.2xlarge
c3.4xlarge
c3.8xlarge
NOTE: 191 entries were truncated, increase --max-results to see more

$ ec2-instance-selector --service emr-5.25.0 --max-results 5
c1.medium
c1.xlarge
c3.2xlarge
c3.4xlarge
c3.8xlarge
NOTE: 197 entries were truncated, increase --max-results to see more

Details:

• InstanceTypes was added as a Filter so that service filters can start with a universal set of instance types without restricting a user's use of the allow-list.
• VirtType was added as a filter since emr and eks both only support hvm instance types

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[brycahta]

how often will this need to be updated?

[bwagner5]

I'm not sure.... This is definitely not an optimal solution, but I think it'll be the best hack available. Other downsides are that users will have to actually update the ec2-instance-selector binary to get updated versions or to add supported instance types to older versions.

[brycahta]

Gotcha, if we see ourselves needing to manually update this list often then we could look into watching and/or pulling directly from the github readme on emr types

[brycahta]

oo nice 🤩

[brycahta]

Looks great! 👍

[rothgar]

Looks great! I was able to combine --service eks with -o one-line for what I needed with eksctl 👍