Issue with long stack traces

Is there a way to prevent the log stack traces from being displayed for basic error messages (e.g. "Table x already exists" ?

```
Error: ER_TABLE_EXISTS_ERROR: Table 'roles' already exists
at Query.Sequence._packetToError (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/sequences/Sequence.js:52:14)
at Query.ErrorPacket (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/sequences/Query.js:77:18)
at Protocol._parsePacket (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Protocol.js:279:23)
at Parser.write (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Parser.js:76:12)
at Protocol.write (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Protocol.js:39:16)
at Socket. (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/Connection.js:103:28)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at TCP.onread (net.js:548:20)
at Protocol._enqueue (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Protocol.js:145:48)
at Connection.query (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/Connection.js:208:25)
at /Volumes/github-image/bitcoin-core/node_modules/db-migrate-mysql/index.js:371:29
From previous event:
at Object.runSql (/Volumes/github-image/bitcoin-core/node_modules/db-migrate-mysql/index.js:366:12)
at Object.createTable (/Volumes/github-image/bitcoin-core/node_modules/db-migrate-base/index.js:240:17)
at Object. (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/driver/shadow.js:37:52)
at runCallback (timers.js:649:20)
at tryOnImmediate (timers.js:622:5)
at processImmediate [as _immediateCallback] (timers.js:594:5)
From previous event:
at Object.db.(anonymous function) [as createTable] (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/driver/shadow.js:36:14)
at Class.exports.up (/Volumes/github-image/bitcoin-core/migrations/20170819024243-create-roles.js:19:13)
at Class. (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/skeleton.js:81:41)
From previous event:
at Class._up (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/skeleton.js:65:12)
at Class.up (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/skeleton.js:149:17)
at Object.up (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/migrator.js:112:14)
at /Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/migrator.js:178:25
From previous event:
at /Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/migrator.js:171:12
at runCallback (timers.js:649:20)
at tryOnImmediate (timers.js:622:5)
at processImmediate [as _immediateCallback] (timers.js:594:5)
From previous event:
at /Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/migrator.js:166:39
at Query._callback (/Volumes/github-image/bitcoin-core/node_modules/db-migrate/lib/migration.js:373:7)
at Query.Sequence.end (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/sequences/Sequence.js:88:24)
at Query._handleFinalResultPacket (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/sequences/Query.js:139:8)
at Query.EofPacket (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/sequences/Query.js:123:8)
at Protocol._parsePacket (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Protocol.js:279:23)
at Parser.write (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Parser.js:76:12)
at Protocol.write (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/protocol/Protocol.js:39:16)
at Socket. (/Volumes/github-image/bitcoin-core/node_modules/mysql/lib/Connection.js:103:28)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at TCP.onread (net.js:548:20)

```

---
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