[WIP]End to End Test for AWSMachinePool

[arghya88]

What this PR does / why we need it:
Adds e2e test for AWSMachinePool
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1983

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[sedefsavas]

@arghya88 This test was not working due to this issue: #2137

I didn't see this PR when adding all CAPI e2e here: #2138
Do you want to continue working on this one (I can remove this from the other PR) or shall we consolidate these two?

[arghya88]

@sedefsavas you can consolidate and we can close this PR.