Fix coverage

Signed-off-by: Chuck Short <chuck.short@canonical.com>

.coveragerc

@@ -5,3 +5,4 @@ omit = nova_lxd/tests/*
 
 [report]
 ignore_errors = True
+precision = 2

tox.ini

@@ -25,7 +25,12 @@ commands = {posargs}
 [testenv:cover]
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
-commands = nosetests --with-xcoverage --cover-package=nova_lxd --cover-tests
+commands = 
+	coverage erase
+	python setup.py testr --coverage --coverage-package-name=nova_lxd \
+	--testr-args='{posargs}'
+	coverage combine
+	coverage html --include='nova_lxd/*' -d covhtml -i
 
 [testenv:docs]
 commands = python setup.py build_sphinx