Fix issue 3860 OpenDS unable to find a certificate in JKS keystore if the alias contains upercase
When OpenDS is configured to use alias xxx-cert in JKS keystore, LDAPS does not work if the alias contains upercase.

Javadoc for KeyStore specifies that
"Whether aliases are case sensitive is implementation dependent. In order to avoid problems, it is recommended not to use aliases in a KeyStore that only differ in case."

This fix compares the found alias with the configured alias name using String.equalsIgnoreCase() instead of String.equals().

We should also document that the user must not define 2 certificates aliases that only differ in case.