Fix for issue 3006: add password verification when creating new site

Review Request #5424 — Created Feb. 7, 2014 and submitted — Latest diff uploaded

Review Board
reviewboard, students

When creating new sites using rb-site install on the command-line, no entered passwords were being verified. If passwords were re-entered incorrectly, it accepted it, completed all the actions, and on the final step reported that the passwords were wrong and aborted installation.
Now after passwords are first entered, the confirmation prompt makes sure that the re-entered password matches the first.
In addition, passwords were printed out to the command line as a default value after the first prompt. This has been removed.