nexus-cli should be able to prompt for password , if not supplied through config or from override

[vgshine]

In the current scenario we have 2 ways to authenticate to server , either it should be supplied in plain text through config file , or user supply it through overrides options. if we doesn't supply it either way it raise an exception.

In both of these cases we are passing the password in plain text , As per our requirement we need to address this security gap and would prompt the password and mask it so it can be passed through secure channel .

As a proposed solution I believe that we can include this password prompt change in Configuration Class file which would have a logic for both the cases , overrides as well as for the config file.
This would prevent supplying password in the plain text for authentication.

Also one more change that would be needed in remote_factory to supply the correct override for pro_remote and oss_remote , so updated overrides Hash needs to be supplied for password to prompt only once.

att_reader: overrides

@overrides = overrides.merge!(configuration)

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