Update application_list.txt Fixture for Sessions

Update the application_list.txt fixture file to include numeric
(non-zero) active sessions for testing.
Add Spec for Version7 deployed_applications Method

Add a spec for the Version7 class deployed_applications method.
Update Version7 for deployed_applications

Update the Version7 class to include a deployed_applications method that
returns a hash of currently deployed applications along with meta
information.
Add Spec for Instance application_list Method

Update the Instance spec to include tests for the application_list
method.
Update Instance for application_list Method

Add the application_list method to the Instance class to return a hash
of currently deployed applications and respective metadata.