Uses dev branch for e2e testing on all feature branches

.travis.yml

@@ -13,7 +13,9 @@ services:
 
 before_install:
   - |
-    if [[ $TRAVIS_BRANCH =~ ^(dev|testing|demo|training|staging|rrt\/.*)$ ]]; then
+    if [[ $TRAVIS_BRANCH =~ ^(feature\/.*)$ ]]; then
+      export E2E_TAG="dev"
+    elif [[ $TRAVIS_BRANCH =~ ^(dev|testing|demo|training|staging|rrt\/.*)$ ]]; then
       export E2E_TAG="${TRAVIS_BRANCH//\//_}"
     else
       export E2E_TAG="latest"