🌱 Fix error in reading ironic htpasswd from file

[MahnoorAsghar]

Update the method of reading ironic htpasswd username and password from file, to make it less sensitive to error whether or not the file ends in newline.

[MahnoorAsghar]

/test ?

[metal3-io-bot]

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• /test metal3-ubuntu-e2e-integration-test-main
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/test ?

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[MahnoorAsghar]

/test metal3-centos-e2e-integration-test-main
/test metal3-ubuntu-e2e-integration-test-main

[dtantsur]

/approve

[metal3-io-bot]

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This pull-request has been approved by: dtantsur

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[elfosardo]

/lgtm