Don't explicitly save sessions

Don't explicitly save sessions

Saving a session causes it to be unlocked, but sessions have a
hook that also performs a save just before the session is finalized.
In CherryPy 3.3.0 and later, an assertion was added to ensure that
a session is locked when trying to perform a save.  Since we perform
explicit saves in our code, this causes the assertion to be tripped
when the hook executes.

This patch removes our explicit save calls.  We should rely on the
hook to save and unlock the session.

https://fedorahosted.org/ipsilon/ticket/84

Signed-off-by: Nathan Kinder <nkinder@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>