Remove nose things

We don't use nose anywhere in anything related to devstack. The only
legitimate OpenStack things that are still nose are horizon and swift
unittests, and it turns out we don't really run those in devstack.

Change-Id: I215e0f3664f269e0e1b8f5d5f9c70553dededddd
lib/dstat: Fix a comment

Apparently this file was copied from lib/apache.

Change-Id: Ie89d423ca225c697122820a1d9e859769aea9f86
Merge "lib/dstat: Fix a comment"