Fix: Correct symlink for sandbox configuration

This adds an extra symlink redirection as we seem to have a programatic
bug / change somewhere pointing stuff to a particular name that didn't
exist.

Change-Id: Ifa932ffa698cac01e42d9a6130b39e10ea003be3
Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>

diff --git a/jenkins-config/managed-config-templates/mavenSettings-serverCredentialMappings.sandbox.yaml b/jenkins-config/managed-config-templates/mavenSettings-serverCredentialMappings.sandbox.yaml
new file mode 120000 (symlink)
index 0000000..d169215
--- /dev/null
+++ b/jenkins-config/managed-config-templates/mavenSettings-serverCredentialMappings.sandbox.yaml
@@ -0,0 +1 @@
+serverCredentialMappings.sandbox.yaml
\ No newline at end of file