Remove duplicated comments in virt/storage_users

Change-Id: Ia8f45dc6588b5e456dcfef9c64b5aa14df9365e7
Separate image props filter unit tests

Pull the unit tests for the image properties filters out of
test_host_filters.py and uncruft the unnecessary service_up stubouts.

Change-Id: I5d2cd393fd18de9debff424d9ef37e549c2a7ea2
Nova should be in charge of its log defaults

Oslo's log module has a set_defaults which Nova can use
to set the context logging format and default log levels.
We should not have to fix default levels in oslo and then
sync across to Nova. This becomes all the more important
when we move to oslo.log library so we should get started
now

Change-Id: Id47099d5a755bc2923b05fe4bef270a7c0f99389
Set logging level for glanceclient to WARN

When capturing a snapshot for example, glanceclient logs
the whole uploaded image into the nova compute logs as
glanceclient's log level is set to DEBUG by default

Change-Id: Ie764517c2a4b91cb02c15096f7f0b4138900c92d
Merge "Remove duplicated comments in virt/storage_users"
Merge "Nova should be in charge of its log defaults"
Merge "Set logging level for glanceclient to WARN"
Merge "Separate image props filter unit tests"