VPC key create and delete operations added

[Madhan-SWE]

What this PR does / why we need it:
This is for creating and deleting key from VPC.

Create key

%./capibmadm vpc key create --name test-key --key-path /Users/madhankumar/.ssh/id_rsa.pub --region eu-de 

VPC Key created successfully, key-name="test-key"

% ./capibmadm vpc key create  --name test-key --public-key "ssh-rsa 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 [email protected]" --region "eu-de"

VPC Key created successfully, key-name="test-key"

Delete key

% ./capibmadm vpc key delete --name test-key --region eu-de

VPC Key deleted successfully, key-name="test-key"

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 #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

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[Madhan-SWE]

/retest-required

[mkumatag]

@Madhan-SWE I see #1085 as well, can you close the duplicate one, and make sure rebase the code as well.

[Prajyot-Parab]

/cc @Amulyam24

[Amulyam24]

/lgtm

/cc @mkumatag

[mkumatag]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, Madhan-SWE, mkumatag

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