ECONNREFUSED for sls dynamodb start

**Actual Behaviour**

Trying to start the database with `sls dynamodb start` it hangs for a while then gives error:

```
connect ECONNREFUSED 127.0.0.1:8000
```

I was able to get it running earlier, but after restarting the computer it stopped working.

Restarting the computer, changing the port and clearing reinstalling `node_modules` doesn't change anything.

There is nothing running on that port, and there are no `java` processes already running to suggest the database is already alive. `http://localhost:8000/shell` does not run and the serverless functions timeout trying to connect to the database.

**Expected Behaviour**

Run `sls dynamodb start` and it runs.

**Steps to reproduce it**

```js
// package.json
{
// ...
"devDependencies": {
// ...
"dynamodb-local": "^0.0.24",
// ...
"serverless-dynamodb-local": "^0.2.35",
"serverless-offline": "^3.31.3",
// ...
}
}
```

```yml
# serverless.yml
custom:
# ...
dynamodb:
stages:
- dev
start:
migrate: true
inMemory: true
noStart: true

plugins:
- serverless-step-functions
- serverless-plugin-typescript
- serverless-dynamodb-local
- serverless-step-functions-offline
- serverless-offline

# ...

resources:
Resources:
ExampleTable:
Type: AWS::DynamoDB::Table
Properties:
AttributeDefinitions:
- AttributeName: foo
AttributeType: S
KeySchema:
- AttributeName: foo
KeyType: HASH
ProvisionedThroughput:
ReadCapacityUnits: 1
WriteCapacityUnits: 1
TableName: ${self:provider.environment.DYNAMODB_TABLE}
```

**LogCat for the issue**

```
$ SLS_DEBUG=* yarn sls dynamodb start
yarn run v1.12.3
$ serverless dynamodb start
Serverless: Load command config
Serverless: Load command config:credentials
Serverless: Load command create
Serverless: Load command install
Serverless: Load command package
Serverless: Load command deploy
Serverless: Load command deploy:function
Serverless: Load command deploy:list
Serverless: Load command deploy:list:functions
Serverless: Load command invoke
Serverless: Load command invoke:local
Serverless: Load command info
Serverless: Load command logs
Serverless: Load command login
Serverless: Load command logout
Serverless: Load command metrics
Serverless: Load command print
Serverless: Load command remove
Serverless: Load command rollback
Serverless: Load command rollback:function
Serverless: Load command slstats
Serverless: Load command plugin
Serverless: Load command plugin
Serverless: Load command plugin:install
Serverless: Load command plugin
Serverless: Load command plugin:uninstall
Serverless: Load command plugin
Serverless: Load command plugin:list
Serverless: Load command plugin
Serverless: Load command plugin:search
Serverless: Load command config
Serverless: Load command config:credentials
Serverless: Load command rollback
Serverless: Load command rollback:function
Serverless: Load command invoke
Serverless: Load command invoke:stepf
Serverless: Load command dynamodb
Serverless: Load command dynamodb:migrate
Serverless: Load command dynamodb:seed
Serverless: Load command dynamodb:start
Serverless: Load command dynamodb:noStart
Serverless: Load command dynamodb:remove
Serverless: Load command dynamodb:install
Serverless: Load command step-functions-offline
Serverless: Load command offline
Serverless: Load command offline:start
Serverless: Invoke dynamodb:start
Serverless: DynamoDB - Error -

Networking Error ---------------------------------------

connect ECONNREFUSED 127.0.0.1:8000

For debugging logs, run again after setting the "SLS_DEBUG=*" environment variable.

Stack Trace --------------------------------------------

NetworkingError: connect ECONNREFUSED 127.0.0.1:8000
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1121:14)
From previous event:
at ServerlessDynamodbLocal.createTable (/Users/foo/bar/node_modules/serverless-dynamodb-local/index.js:290:16)
at BbPromise.each (/Users/foo/bar/node_modules/serverless-dynamodb-local/index.js:169:55)
From previous event:
at ServerlessDynamodbLocal.migrateHandler (/Users/foo/bar/node_modules/serverless-dynamodb-local/index.js:169:26)
at BbPromise.resolve.then (/Users/foo/bar/node_modules/serverless-dynamodb-local/index.js:219:45)
From previous event:
at ServerlessDynamodbLocal.startHandler (/Users/foo/bar/node_modules/serverless-dynamodb-local/index.js:219:10)
at BbPromise.reduce (/Users/foo/bar/node_modules/serverless/lib/classes/PluginManager.js:391:55)
From previous event:
at PluginManager.invoke (/Users/foo/bar/node_modules/serverless/lib/classes/PluginManager.js:391:22)
at PluginManager.run (/Users/foo/bar/node_modules/serverless/lib/classes/PluginManager.js:422:17)
at variables.populateService.then.then (/Users/foo/bar/node_modules/serverless/lib/Serverless.js:157:33)
at processImmediate (timers.js:632:19)
at process.topLevelDomainCallback (domain.js:120:23)
From previous event:
at Serverless.run (/Users/foo/bar/node_modules/serverless/lib/Serverless.js:144:8)
at serverless.init.then (/Users/foo/bar/node_modules/serverless/bin/serverless:44:28)

Get Support --------------------------------------------
Docs: docs.serverless.com
Bugs: github.com/serverless/serverless/issues
Issues: forum.serverless.com

Your Environment Information -----------------------------
OS: darwin
Node Version: 11.3.0
Serverless Version: 1.34.1

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
```

Start with the dynamodb:start entry point and the stack-trace locations in node_modules/serverless-dynamodb-local/index.js, then reproduce the command using the provided serverless.yml and package.json configuration. Done means `sls dynamodb start` completes without ECONNREFUSED, the local DynamoDB endpoint responds at port 8000, and table migration succeeds.

Written by the indexing model from the issue text.