Added --force-rm to compose build.

It's a flag passed to docker build that removes the intermediate
containers left behind on fail builds.

Signed-off-by: Adrian Budau <budau.adi@gmail.com>

tests/unit/service_test.py

@@ -356,6 +356,7 @@ class ServiceTest(unittest.TestCase):
             stream=True,
             path='.',
             pull=False,
+            forcerm=False,
             nocache=False,
             rm=True,
         )