TT#30555 Add natping key to location table

Change-Id: I1c71e4b8125e29a7efc10471bd41f89ddf21facd

db_scripts/diff/15377.down

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+USE kamailio;
+
+ALTER TABLE location DROP KEY part_kal_idx;

db_scripts/diff/15377.up

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+USE kamailio;
+
+ALTER TABLE location ADD KEY part_kal_idx (`partition`, `keepalive`);