Added 'recheck' trigger to pipeline verify job; removed superfluous node specification

Change-Id: Ie8dc277ceaaa017fe68b65a68006916292154410
diff --git a/jjb/onos/onos-buck-gerrit-pipeline.yaml b/jjb/onos/onos-buck-gerrit-pipeline.yaml
index 923e99a..4fe2f5c 100644
--- a/jjb/onos/onos-buck-gerrit-pipeline.yaml
+++ b/jjb/onos/onos-buck-gerrit-pipeline.yaml
@@ -17,7 +17,6 @@
           branch: 'master'
           lftools-version: '<1.0.0'
 
-    node: 'ubuntu16.04-basebuild-8c-15g'
     concurrent: true
 
     pipeline-scm:
@@ -46,6 +45,8 @@
                 exclude-trivial-rebase: false
                 exclude-no-code-change: true
             - draft-published-event
+            - comment-added-contains-event:
+                comment-contains-value: '(?i)^.*recheck$'
           projects:
             - project-compare-type: PLAIN
               #project-pattern: '{project}'