AMBARI-25992: logsearch-portal cannot startup due to spring-boot-autoconfigure upgrade

[rzuo]

What changes were proposed in this pull request?

ambari-logsearch-portal server cannot startup.

After spring-boot upgrade from 2.0.6.RELEASE to 2.1.5.RELEASE, due to the change of class LdapAutoConfiguration, spring need the LdapTemplate bean during startup.

The full error log please see issue AMBARI-25992.

How was this patch tested?

local install and test this fix in local cluster.

(Please explain how this patch was tested. Ex: unit tests, manual tests) (If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)

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