UTs for no_manage=false

[jayanthvn]

What type of PR is this?
Feature

Which issue does this PR fix:
Add UTs

What does this PR do / Why do we need it:
UTs for no manage false

If an issue # is not available please add repro steps and logs from IPAMD/CNI showing the issue:

Testing done on this change:

PASS
coverage: 100.0% of statements
ok  	github.com/aws/amazon-vpc-cni-k8s/pkg/utils/retry	0.003s	coverage: 100.0% of statements
?   	github.com/aws/amazon-vpc-cni-k8s/pkg/utils/ttime	[no test files]
?   	github.com/aws/amazon-vpc-cni-k8s/pkg/utils/ttime/mocks	[no test files]
?   	github.com/aws/amazon-vpc-cni-k8s/pkg/version	[no test files]

Automation added to e2e:

N/a
Will this break upgrades or downgrades. Has updating a running cluster been tested?:
n/a

Does this change require updates to the CNI daemonset config files to work?:

n/a

Does this PR introduce any user-facing change?:

n/a

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

[M00nF1sh]

/lgtm