package.py: new_package no longer returns PackageStatus

To implement status support for MISSING and DELETED, there needed to be more
data included in the return type of new_package() such as name.

Other changes include:

* Added the is_aur_package argument to aur_get_package_status().
* Added the status argument to PackageBase.
* There are no queries to AUR in the tests.
Disabled tests in test_chroot.py