The bin/solr script should handle SOLR_JETTY_HOST

The SOLR_JETTY_HOST environment variable is handled by bin\solr.cmd, where it is assigned to a Java system property called jetty.host.  This handling does not exist in bin/solr, making it necessary for an end user to use SOLR_ADDL_ARGS and be aware of java's commandline syntax.

I believe this problem exists in all Solr versions that utilize bin/solr, and a fix should be applied to the main branch and branch_8x.