ci-yadp-builder jobs: switch to using python3 version

After syncing up the yadp_builder.py from the
ci-yadp-builder repo, we should use it instead of
the yadp_builder_v2.py script (which is python2).

We should also call python3 explicitly instead of
relying on the system symlink to be present.

Signed-off-by: Kelley Spoon <kelley.spoon@linaro.org>
Change-Id: I244be8df7ed0149dc96e2c833bf2af37a2fb0eb7
diff --git a/ci-yadp-builder-sanity.yaml b/ci-yadp-builder-sanity.yaml
index 068a235..408290f 100644
--- a/ci-yadp-builder-sanity.yaml
+++ b/ci-yadp-builder-sanity.yaml
@@ -58,7 +58,7 @@
             git fetch https://review.trustedfirmware.org/${GERRIT_PROJECT} ${GERRIT_REFSPEC}
             git checkout -q FETCH_HEAD
 
-            python yadp_builder_v2.py --dryrun
+            python3 yadp_builder.py --dryrun
     publishers:
         - email:
             recipients: 'linaro-infrastructure-errors@lists.linaro.org'
diff --git a/ci-yadp-builder.yaml b/ci-yadp-builder.yaml
index 394b041..c0c78f5 100644
--- a/ci-yadp-builder.yaml
+++ b/ci-yadp-builder.yaml
@@ -57,7 +57,7 @@
             git fetch https://review.trustedfirmware.org/${GERRIT_PROJECT} ${GERRIT_REFSPEC}
             git checkout -q FETCH_HEAD
 
-            python yadp_builder_v2.py
+            python3 yadp_builder.py
     publishers:
         - email:
             recipients: 'linaro-infrastructure-errors@lists.linaro.org'