Fix Connection's password_dictionary

[bishtawi]

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Fixes #127

Changes proposed in this pull request:

• Turn password_dictionary from just a plain map to a more complex resource that has a enable field (boolean), and dictionary (list of strings).

[alexkappa]

Hi @bishtawi, thanks for the submission. Any chance we can pair this with some tests?

[alexkappa]

Rebased and merged offline. Thank you!