OCM-6879 | fix: allow user specify cluster-admin as admin username in day-1

[marcolan018]

Signed-off-by: marcolan018 llan@redhat.com

[codecov]

Codecov Report

Attention: Patch coverage is 31.57895% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 21.19%. Comparing base (053e5e8) to head (a69e789).
Report is 10 commits behind head on master.

Files	Patch %	Lines
cmd/create/idp/htpasswd.go	33.33%	12 Missing ⚠️
cmd/create/cluster/cmd.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1869      +/-   ##
==========================================
+ Coverage   20.63%   21.19%   +0.56%     
==========================================
  Files         102      104       +2     
  Lines       17270    17724     +454     
==========================================
+ Hits         3563     3757     +194     
- Misses      13439    13684     +245     
- Partials      268      283      +15     

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[robpblake]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marcolan018, robpblake

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[openshift-ci]

@marcolan018: all tests passed!

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