Improve on IAM test coverage

[dkeohane]

Created a PR of some tests to expand golang testing knowledge and our test coverage for iam.go

[codecov-commenter]

Codecov Report

Merging #624 (f57abb8) into master (84b11dd) will increase coverage by 4.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
+ Coverage   20.17%   24.20%   +4.03%     
==========================================
  Files          46       46              
  Lines        4426     4457      +31     
==========================================
+ Hits          893     1079     +186     
+ Misses       3472     3304     -168     
- Partials       61       74      +13     

Impacted Files	Coverage Δ
pkg/controller/account/iam.go	73.75% <100.00%> (+19.37%)	:arrow_up:
pkg/apis/aws/v1alpha1/account_types.go	89.39% <0.00%> (-0.32%)	:arrow_down:
pkg/controller/account/ec2.go	0.00% <0.00%> (ø)
pkg/controller/account/account_controller.go	9.14% <0.00%> (+2.80%)	:arrow_up:
pkg/controller/utils/conditions.go	27.50% <0.00%> (+16.32%)	:arrow_up:
pkg/controller/utils/utils.go	64.61% <0.00%> (+16.92%)	:arrow_up:
pkg/controller/account/byoc.go	61.62% <0.00%> (+23.48%)	:arrow_up:
pkg/apis/aws/v1alpha1/accountclaim_types.go	45.00% <0.00%> (+35.00%)	:arrow_up:
pkg/controller/utils/status.go	91.66% <0.00%> (+45.83%)	:arrow_up:

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dkeohane, lisa

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