Fix filtering kitchen envs

Change-Id: I81f4c43f9bc6152955fb24b21f1b637d26c1d4e4
diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index 0e956d5..4281641 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -467,7 +467,7 @@
  */
 
 def filterKitchenEnvs(input = []) {
-    def variablesList = input[0].split().flatten().sort()
+    def variablesList = input.split().flatten().sort()
     variablesList.removeAll { it.toUpperCase().contains('SUITE') }
     return variablesList.join(' ')
 }
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