Do not check the mergeable flag in ChangeInfo

Since the merge of I28e90e17ab the change query does not
return anymore the 'mergeable' in the ChangeInfo of the
reponse payload.

Build the change anyway, because the mergeable status is
not known: if the change isn't mergeable, it will fail the
build anyway.

Change-Id: I04fe706863b1d17303ef2b55561be650712fbea8
diff --git a/jenkins/gerrit-verifier-flow.groovy b/jenkins/gerrit-verifier-flow.groovy
index 608a8f0..117f711 100644
--- a/jenkins/gerrit-verifier-flow.groovy
+++ b/jenkins/gerrit-verifier-flow.groovy
@@ -84,11 +84,6 @@
       return false
   }
 
-  if(!change.mergeable) {
-      println "[WARNING] Skipping change ${changeUrl(change._number)} because has merge conflicts"
-      return false
-  }
-
   if(change.hashtags.contains("skipci")) {
       println "[WARNING] Skipping change ${changeUrl(change._number)} because it is tagged with #skipci"
       return false