Update gateway URL to default for helloc example
Update gateway URL to default for helloc example

- this caused confusion for a user who had logged in for
"127.0.0.1", but not for "localhost" then saw an error when
deploying and trying to access "localhost" for which there
was no credential available.

Signed-off-by: Alex Ellis (VMware) <5f7133baa0f5c7ca63ff11e11f2e2b0d2cf077c8@gmail.com>

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