Maintain instance types

[durandom]

This takes data from

• https://raw.githubusercontent.com/powdahound/ec2instances.info/master/www/instances.json
• https://aws.amazon.com/ec2/instance-types/#instance-type-matrix
• https://aws.amazon.com/ec2/previous-generation/#Previous_Generation_Instance_Details_and_Pricing_

and creates a new instance_types.rb file to be copied over app/models/manageiq/providers/amazon/instance_types.rb

It can be run via a rake task

❯ bin/rails providers:amazon:instance_types
Created ./instance_types.rb with 21 new, 4 newly deprecated and 0 new
discontinued instances.
Now copy it to the existing one:

mv instance_types.rb
app/models/manageiq/providers/amazon/instance_types.rb

It maintains order of the current instances.

NOTE: I havent found a better place than a rake task for this. I started out with a spec, but specs should not create files. Then a tools/ script, but I can't rails runner in an engine. Now it's a task.
For this, I had to load a engine tasks in the Rakefile. I opted to put them under the providers:amazon namespace, because they are also loaded in the core repo

If you want I could split this into 2 PRs

1. change Rakefile
2. add rake task

fixes https://bugzilla.redhat.com/show_bug.cgi?id=1427966

cc @bronaghs @Fryguy @blomquisg

[durandom]

includes #171
because new instances is euwe/yes and this is euwe/no

[miq-bot]

Some comments on commits durandom/manageiq-providers-amazon@69db2fc~...36effca

lib/tasks/instance_types.rake

• ⚠️ - 208 - Detected puts. Remove all debugging statements.
• ⚠️ - 211 - Detected puts. Remove all debugging statements.

[miq-bot]

Checked commits durandom/manageiq-providers-amazon@69db2fc~...36effca with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
8 files checked, 5 offenses detected

app/models/manageiq/providers/amazon/instance_types.rb

• ❗ - Line 1312, Col 35 - Style/NumericLiterals - Separate every 3 digits in the integer portion of a number with underscores(_).
• ❗ - Line 1723, Col 35 - Style/NumericLiterals - Separate every 3 digits in the integer portion of a number with underscores(_).
• ❗ - Line 784, Col 35 - Style/NumericLiterals - Separate every 3 digits in the integer portion of a number with underscores(_).
• ❗ - Line 808, Col 35 - Style/NumericLiterals - Separate every 3 digits in the integer portion of a number with underscores(_).
• ❗ - Line 832, Col 35 - Style/NumericLiterals - Separate every 3 digits in the integer portion of a number with underscores(_).