RANGER-5259: Add REST API to delete stale entries of Plugin info

[pradeepagrawal8184]

What changes were proposed in this pull request?

We are adding two REST APIs in ranger-admin to delete stale plugin info entries:

Delete based on plugin info entry id : plugins/plugins/info/{id}

Example: if the plugin info entry id is 9 which need to be deleted then below REST shall work.

curl -ivk -u admin:Admin123 -H "Accept: application/json" -H "Content-Type: application/json" -X DELETE https://<ranger_host>:6182/service/plugins/plugins/info/9

Delete based on plugin info entry attributes : plugins/plugins/info

Case-1: if you want to delete all plugin info entries of a ranger service.

curl -ivk -u admin:Admin123 -H "Accept: application/json" -H "Content-Type: application/json" -X DELETE "https://<ranger_host>:6182/service/plugins/plugins/info?serviceName=${SERVICE_NAME}"

Case-2: if you want to delete all plugin info entries of a ranger service and host name.

curl -ivk -u admin:Admin123 -H "Accept: application/json" -H "Content-Type: application/json" -X DELETE "https://<ranger_host>:6182/service/plugins/plugins/info?serviceName=${SERVICE_NAME}&pluginHostName=${HOST_NAME}"

Case-3: if you want to delete all plugin info entries of a ranger service, host and application name/type.

curl -ivk -u admin:Admin123 -H "Accept: application/json" -H "Content-Type: application/json" -X DELETE "https://<ranger_host>:6182/service/plugins/plugins/info?serviceName=${SERVICE_NAME}&pluginHostName=${HOST_NAME}&pluginAppType=${APPLICATION_NAME}"

How was this patch tested?

Manually: via calling the above given REST point

[kumaab]

The changes look good, I think it would be good to add unit tests for the new API as well. thanks.