Add coturn servers table

migrations/V124__coturn_servers.sql

@@ -0,0 +1,13 @@
+create table coturn_servers
+(
+    id            int(11) unsigned       not null auto_increment,
+    region        varchar(20)            not null comment 'Region of the server for simple user-based selection if latency checks don''t work',
+    host          varchar(255)           not null,
+    port          mediumint default 3478 not null,
+    preshared_key varchar(255)           not null comment 'Should be only accessible to clients with lobby scope.',
+    contact_email varchar(255)           not null comment 'Email of the responsible server administrator',
+    active        boolean default true   not null,
+    PRIMARY KEY(id),
+    UNIQUE KEY `unique_host_port` (`host`, `port`)
+)
+    comment 'List of coturn servers to be propagated to ICE adapters';