adding retry to plugins.sh for curl
diff --git a/plugins.sh b/plugins.sh
index ec8e8e5..f052d98 100755
--- a/plugins.sh
+++ b/plugins.sh
@@ -23,6 +23,6 @@
     if [ -z "$JENKINS_UC_DOWNLOAD" ]; then
       JENKINS_UC_DOWNLOAD=$JENKINS_UC/download
     fi
-    curl -sSL -f ${JENKINS_UC_DOWNLOAD}/plugins/${plugin[0]}/${plugin[1]}/${plugin[0]}.hpi -o $REF/${plugin[0]}.jpi
+    curl --retry 3 --retry-delay 5 -sSL -f ${JENKINS_UC_DOWNLOAD}/plugins/${plugin[0]}/${plugin[1]}/${plugin[0]}.hpi -o $REF/${plugin[0]}.jpi
     unzip -qqt $REF/${plugin[0]}.jpi
 done  < $1