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gwpy.io: return unique creds from parse_keytab

This PR fixes an issue in gwpy.io.kerberos whereby keytab files with multiple copies of the same kvno/principal would be returned, causing kinit() to fall over. parse_keytab() has been modified to return an ordered, unique list of credentials, and also to return a list of tuple, rather than a list of list.

cc @scottcoughlin2014

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