[FINE] load regions list from aws-sdk gem's source & disable special ones

[AlexanderZagaynov]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1500613
This is a cherry-picks from:
#265, #392, #436, #443, #446
@simaishi please review

[simaishi]

@AlexanderZagaynov @bronaghs A few questions...

1. The BZ is marked to be fixed for 'master' branch only. If we need/want to fix in Fine branch, we must also fix in gaprindashvili branch. Please make sure gaprindashvili/yes label exists on all needed PRs.

2. Are those cherry-picks not clean? We always prefer a cherry-pick over a separate PR for G/F branches, if possible.

[AlexanderZagaynov]

@simaishi Version field's value in that BZ is 5.8.0.
I understood that as I should prepare a PR for Fine.
Even more you mentioned PR necessity here: #443 (comment)
Those commits can't be simply cherry-picked, I had to solve a couple of merge conflicts.
For Gaprindashvili I guess those commits can be cherry-picked directly.

[simaishi]

Thanks for clarifying about cherry-pick.

"version" indicates where the issue was found, and doesn't always match which version we want to fix in... The version we want to fix shows up as Target Release in BZ. That's why I asked... @bronaghs please confirm we want to fix this in G/F branch as well.

[miq-bot]

Checked commits AlexanderZagaynov/manageiq-providers-amazon@2f4d0a6~...428546f with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
7 files checked, 1 offense detected

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[bronaghs]

hi @AlexanderZagaynov, @simaishi
This does not need to be backported to fine or gaprandishvili (target release of https://bugzilla.redhat.com/show_bug.cgi?id=1500613 is 5.10 and loading regions from aws-sdk gem is an RFE).