allow Install4j 7.0.3 to update config schema (#893)
allow Install4j 7.0.3 to update config schema (#893)

* related to OF-1383 work on java9 support
 * also updated setting to set min jre version to 1.7
igniterealtime/Openfire,speedy01/Openfire,guusdk/Openfire,speedy01/Openfire,GregDThomas/Openfire,akrherz/Openfire,igniterealtime/Openfire,igniterealtime/Openfire,speedy01/Openfire,akrherz/Openfire,GregDThomas/Openfire,guusdk/Openfire,Gugli/Openfire,guusdk/Openfire,igniterealtime/Openfire,akrherz/Openfire,Gugli/Openfire,guusdk/Openfire,akrherz/Openfire,igniterealtime/Openfire,GregDThomas/Openfire,guusdk/Openfire,Gugli/Openfire,Gugli/Openfire,speedy01/Openfire,GregDThomas/Openfire,speedy01/Openfire,akrherz/Openfire,Gugli/Openfire,GregDThomas/Openfire