[reSIProcate] [reTurn][patch][gsoc] Added support for multiple users

[Catalin Usurelu]

The current implementation of reTurnServer supports a single
username/password.  These values are specified in /etc/reTurnServer.config.

I've added support for multiple usernames and passwords.

Parameter in the main config file, for database file:
UserDatabaseFile = /etc/reTurn/users.txt

Format of each line: login:password:realm:state
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