Functional test Ubuntu source building

Change-Id: Ia3fa83645545bcd7d259fe7c973c849bd6cb1426
Implements: blueprint gate-source-builds

tox.ini

@@ -62,6 +62,15 @@ commands =
    bash -c "if [ ! -d .testrepository ]; then testr init; fi"
    sudo -g docker testr run test_build.BuildTestCentosSourceDocker
 
+[testenv:images-ubuntu-source]
+whitelist_externals = find
+                      bash
+                      sudo
+commands =
+   find . -type f -name "*.pyc" -delete
+   bash -c "if [ ! -d .testrepository ]; then testr init; fi"
+   sudo -g docker testr run test_build.BuildTestUbuntuSourceTemplate
+
 [testenv:images-centos-binary-docker]
 whitelist_externals = find
                       bash