minor ssl_init_CheckServers() enhancements:

- pass the ptemp (temporary pool) so we don't need to create a subpool
  and destroy it ourselves.

- change ssl_ds_table usage to apr_hash_t


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@93887 13f79535-47bb-0310-9956-ffa450edef68