Add db.close() to process exit event for alpine-logging

[githubbob42]

Mingle Card: 3699 Alpine-Logging PR 12

Narrative

As a …, I can …, so that …

Acceptance Criteria

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Related Stories

1. See card #3690 for details

Tasks

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Test Plan

• clone/fetch the alpine-logging repo

• run “npm start”

  • you should see messages about Mongo connecting to the database
     ``` Logging: Connecting to mongo...

    MONGODB: Logging: Connecting to mongodb://localhost/messages

    MONGODB: Logging: Connection Successful.

    Logging: Successfully opened 'errors' collection.

• hit control-c to kill the process

  • You should see message about closing the database
     ``` Logging: closing database connection

    Logging: database closed

[githubbob42]

Pull Request #12