Allow pre-startup Solr log management in Solr bin scripts to be disabled.

There is log rotation and log archiver in solr starter script, which is failing if solr is deployed with custom log configuration (different log filename). Also inconvenient if using custom log rotation/management.
https://github.com/apache/lucene-solr/blob/master/solr/bin/solr#L1464

Proposing an environment setting, something like SOLR_LOG_PRESTART_ROTATION (with default true), that makes the execution of the four lines configurable.