Generate more test data in test resources

Currently, the test resources that are used in AMPS Confluence plugin contain no spaces (other than the demo space), and only one "admin" user.

This is unlikely an ideal initial set up for most plugin developers.

I would propose to make the following changes to the test resources:

• add a new 'sysadmin' user that has confluence administrator permission
• change the current 'admin' user to have only administrator permission (revoke the confluence administrator permission)
• add a new non-admin user 'joe' or 'fred'.

Ideally the changes mentioned above are the same across all product's test resources to make it easier to write tests for cross-product plugin.

Additionally, we should also make the following changes specifically for Confluence:

• add a new space "TEST" (instead of testing against the demo space)
• add a couple of pages and blog posts to the "TEST" space, ideally with some comments.