Change tox targets to use new build.py

tox -e images-centos-binary
tox -e images-centos-source

Both above now execute parallel image building script.

Change-Id: I6a4174b184fc239c6baa950a9c787fc6ad220774
Paritally-Implements: blueprint gate-source-builds

tox.ini

@@ -49,23 +49,16 @@ whitelist_externals = find
 commands =
    find . -type f -name "*.pyc" -delete
    bash -c "if [ ! -d .testrepository ]; then testr init; fi"
-   sudo -g docker testr run ^(test_build).*
+   sudo -g docker testr run test_build.BuildTestCentosBinary
 
 [testenv:images-centos-source]
 whitelist_externals = find
                       bash
                       sudo
-                      echo
-                      mv
-                      rm
 commands =
-   bash -c "if [ -f .buildconf ]; then mv .buildconf buildconf.bak; fi"
-   bash -c "echo PREFIX=centos-source- > .buildconf"
    find . -type f -name "*.pyc" -delete
    bash -c "if [ ! -d .testrepository ]; then testr init; fi"
-   sudo -g docker testr run ^(test_images).*
+   sudo -g docker testr run test_build.BuildTestCentosSource
-   rm -f .buildconf
-   bash -c "if [ -f buildconf.bak ]; then mv buildconf.bak .buildconf; fi"
 
 [testenv:startenv]
 whitelist_externals = bash