in retry_until only read the last mongo client line (#18630)

Signed-off-by: Kai Timmer <kai@staffbase.com>

stable/mongodb-replicaset/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: mongodb-replicaset
 home: https://github.com/mongodb/mongo
-version: 3.10.1
+version: 3.10.2
 appVersion: 3.6
 description: NoSQL document-oriented database that stores JSON-like documents with
   dynamic schemas, simplifying the integration of data in content-driven applications.

stable/mongodb-replicaset/init/on-start.sh

@@ -51,7 +51,7 @@ retry_until() {
         creds=()
     fi
 
-    until [[ $(mongo admin --host "${host}" "${creds[@]}" "${ssl_args[@]}" --quiet --eval "${command}") == "${expected}" ]]; do
+    until [[ $(mongo admin --host "${host}" "${creds[@]}" "${ssl_args[@]}" --quiet --eval "${command}" | tail -n1) == "${expected}" ]]; do
         sleep 1
 
         if (! ps "${pid}" &>/dev/null); then