Remove IP access rule for a Solr Index

1. GET https://opensolr.com/solr_manager/api/delete_ip
2. Parameters:
   1. ​email - your opensolr registration email address
   2. api_key - your opensolr api_key
   3. core_name - the name of the core you wish to remove an IP rule from
   4. ip - the IP address you wish to remove from your core_name
   5. handler - the SOLR URI handler that the restriction has been applied to

3. Example: https://opensolr.com/solr_manager/api/delete_ip?email=PLEASE_LOG_IN&
   api_key=PLEASE_LOG_IN&core_name=my_solr_core&ip=15.24.53.123&handler=/update