Increase waiting time for getting csr

Author: TommyLike

installer/chart/volcano/plugins/gen-admission-secret/gen-admission-secret.sh

@@ -108,7 +108,7 @@ done
 # approve and fetch the signed certificate
 kubectl certificate approve ${csrName}
 # verify certificate has been signed
-for x in $(seq 10); do
+for x in $(seq 15); do
     serverCert=$(kubectl get csr ${csrName} -o jsonpath='{.status.certificate}')
     if [[ ${serverCert} != '' ]]; then
         break