Change 14643

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Implement P4#tickets for P4Ruby

P4#tickets checks P4#ticket_file, if it's a directory or does not exist it just
returns 'nil'.  Otherwise it iterates over the file and inserts each line into
an array of hashes.  Each hash is a single ticket entry:

    key: ticket key (hostname:port=user)
    value: ticket value

Update unit test to test new functionality.
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