Merge remote-tracking branch 'origin/MAGETWO-53689-split-integration-tests' into PR_Branch

Author: ark99

.travis.yml

@@ -14,11 +14,12 @@ php:
 env:
   global:
     - COMPOSER_BIN_DIR=~/bin
-    - INTEGRATION_SETS=2
+    - INTEGRATION_SETS=3
   matrix:
     - TEST_SUITE=unit
     - TEST_SUITE=integration INTEGRATION_INDEX=1
     - TEST_SUITE=integration INTEGRATION_INDEX=2
+    - TEST_SUITE=integration INTEGRATION_INDEX=3
     - TEST_SUITE=static
 cache:
   apt: true