Update the values of properties according to sentry configurations

In the 'Deploying RecordService Using Cloudera Manager' section of installOnCluster page, for the configurations in the field 'Configuration Snippet (Safety Valve) for sentry-site.xml', we should let users to update the values of properties according to sentry configurations in their own cluster. eg. sentry.service.server.principal, sentry.service.client.server.rpc-address and sentry.service.client.server.rpc-port

They can find sentry configurations either from CM sentry process or sentry process directory: /var/run/cloudera-scm-agent/process/*-sentry-SENTRY_SERVER/sentry-site.xml