Speed up 'make ci' and trim the output

The virtualenv is conditionally rebuilt now if the test requirements
file is modified. This will save upwards of 30+ seconds in iterative
'make ci' runs.

The pylint output is now trimmed to exclude disabled tests.

The order of the 'ci' target prerequisites has been changed to run the
fastest tests first.

Closes #2933

utils/Makefile

@@ -59,13 +59,18 @@ docs: $(MANPAGES)
 viewcover:
 	xdg-open cover/index.html
 
-virtualenv:
+# Conditional virtualenv building strategy taken from this great post
+# by Marcel Hellkamp:
+# http://blog.bottlepy.org/2012/07/16/virtualenv-and-makefiles.html
+venv: oo-installenv/bin/activate
+oo-installenv/bin/activate: test-requirements.txt
 	@echo "#############################################"
 	@echo "# Creating a virtualenv"
 	@echo "#############################################"
-	virtualenv $(NAME)env
+	test -d venv || virtualenv $(NAME)env
 	. $(NAME)env/bin/activate && pip install setuptools==17.1.1
 	. $(NAME)env/bin/activate && pip install -r test-requirements.txt
+	touch $(NAME)env/bin/activate
 #       If there are any special things to install do it here
 #       . $(NAME)env/bin/activate && INSTALL STUFF
 
@@ -80,7 +85,7 @@ ci-pylint:
 	@echo "#############################################"
 	@echo "# Running PyLint Tests in virtualenv"
 	@echo "#############################################"
-	. $(NAME)env/bin/activate && python -m pylint --rcfile ../git/.pylintrc $(shell find ../ -name $(NAME)env -prune -o -name test -prune -o -name "*.py" -print)
+	. $(NAME)env/bin/activate && python -m pylint --rcfile ../git/.pylintrc $(shell find ../ -name $(NAME)env -prune -o -name test -prune -o -name "*.py" -print) 2>&1 | grep -E -v '(locally-disabled|file-ignored)'
 
 ci-list-deps:
 	@echo "#############################################"
@@ -93,7 +98,11 @@ ci-flake8:
 	@echo "# Running Flake8 Compliance Tests in virtualenv"
 	@echo "#############################################"
 	. $(NAME)env/bin/activate && flake8 --config=setup.cfg ../ --exclude="utils,../inventory"
-	. $(NAME)env/bin/activate && python setup.py flake8 
+	. $(NAME)env/bin/activate && python setup.py flake8
 
-ci: clean virtualenv ci-list-deps ci-flake8 ci-pylint ci-unittests
-	:
+ci: venv ci-list-deps ci-unittests ci-flake8 ci-pylint
+	@echo
+	@echo "##################################################################################"
+	@echo "VIEW CODE COVERAGE REPORT WITH 'xdg-open cover/index.html' or run 'make viewcover'"
+	@echo "To clean your test environment run 'make clean'"
+	@echo "Other targets you may run with 'make': 'ci-pylint', 'ci-unittests', 'ci-flake8'"