OPNSense/core b693a3bsrc/etc/inc/plugins.inc.d ipsec.inc, src/www vpn_ipsec_phase1.php vpn_ipsec.php

ipsec, add ike keyexchange option, for https://github.com/opnsense/core/issues/2642
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+4-4src/www/vpn_ipsec_phase1.php
+2-2src/etc/inc/plugins.inc.d/ipsec.inc
+2-1src/www/vpn_ipsec.php
+8-73 files

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