TT#109104 Add new subscriber location mapping mode: forward

New subscriber location mapping mode "forward" is now part of the
enumeration inside provisioning.voip_subscriber_location_mappings.

Change-Id: I93bbecd1e88452ddbc5249f344c3ad66ddea8739

db_scripts/diff/15714.down

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+USE provisioning;
+
+ALTER TABLE `voip_subscriber_location_mappings` CHANGE mode mode ENUM ('add','replace','offline') NOT NULL DEFAULT 'replace';

db_scripts/diff/15714.up

@@ -0,0 +1,3 @@
+USE provisioning;
+
+ALTER TABLE `voip_subscriber_location_mappings` CHANGE mode mode ENUM ('add','replace','offline','forward') NOT NULL DEFAULT 'replace';