Implemented test_cloud_instance_discovery.py

1. Added cfme/test/cloud/test_cloud_instance_discovery.py, which is based on cfme/tests/infrastructure/test_vm_discovery.py

2. Added _load_details() to the Provider class in cfme/cloud/provider.py

3. Added a try/catch around call to is_vm_suspended() in Vm.delete_from_provider() for cases where the provider doesn't support returning Vm status (EC2)

4. Paginator.find() now raises an error if the element is not found

5. Misc. small bug fixes and improvements
Basic Storage coverage.
Adding sauce marker and marking initial sauce tests
Add Tenants page to menu

This was breaking some nav tests
removed assets check in precompile_assets

jweiss discovered a case where the assets dir can exist but the assets
still need to be precompiled, so for now I've removed the check, and we'll
need to revisit this to find a better way to see if assets need to be precompiled or not.

Maybe keeping the check and adding a --force flag is the right answer. I'm not sure...
Merge pull request #1156 from blrm/sauce_tests

Adding a marker for Sauce, and marking initial tests.
Merge remote-tracking branch 'upstream/pr/1200'

Conflicts:
	cfme/tests/test_nav.py
Merge remote-tracking branch 'upstream/pr/1030'

Conflicts:
	cfme/tests/test_nav.py
Merge remote-tracking branch 'upstream/pr/1041' into HEAD

Conflicts:
	cfme/infrastructure/virtual_machines.py
cleanup/dedup code
Merge pull request #1041 and cleanup