Fix variable naming discrepancy in services.py/login. Add support for boot-time kernel messages.

[calin-iorgulescu]

• Fix the ugly variable naming problem in services.py/login .
• Retrieve user info from the session variables.
• Add support for boot-time kernel message recording.

This confirms that issue #15 is no longer valid (netconsole logging works fine, but not necessarily due to these commits).