Update Watson Machine Learning auth with IAM

[Tomcli]

Starting from Aug 1st, Watson ML requires IAM auth using the apikey for authentication. Thus, we need to update our client code and creds.ini to include apikey from now on.

/assign @animeshsingh

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This change is 

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[animeshsingh]

Is this in addition to username/password?

[Tomcli]

username/password becomes optional now since the apikey is mandatory due to IAM auth. username/password is still being used for services such as openscale, but for train/store/deploy we can opt out. I can remove the username/password section if it confuses the users.

[Tomcli]

Looks like the Watson ML product team decided to deprecate the username/password way of authentication, I will remove those reference in my next commit.

[Tomcli]

@animeshsingh I removed all the old username/password reference and should be good to go now.

[animeshsingh]

/lgtm
/approve

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