Add rake task for bucket lifecycle config

[BasilMawejje]

PT Story: Backups: (AWS) automate keeping non-daily backups

PT URL: https://www.pivotaltracker.com/story/show/173667123

This is part of the overall story to automate AWS backups.

Changes proposed in this pull request:

1. Add rake task for s3 bucket lifecycle config

Screenshots (Optional):

--- ## Ready for review: @weedySeaDragon

[weedySeaDragon]

Just in case you haven't already figured it out,
I figured out what the 'Malformed XML...' problem was from this
aws/aws-sdk-ruby#2350

Also: We don't need to specify both the date for an action (e.g. transition, expiration) and the number of days. We're just concerned with the number of days.

This is what I was able to put successfully:

 aws_client.put_bucket_lifecycle_configuration({
                                                        bucket: aws_s3_backup_bucket_name,
                                                        lifecycle_configuration: {
                                                          rules: [
                                                            {
                                                              expiration: { days: 3650 },
                                                              id: "Transition objects to GLACIER after 90 days then move them to DEEP_ARCHIVE after 450 days",
                                                              filter: {
                                                                prefix: aws_s3_backup_bucket_full_prefix
                                                              },
                                                              status: 'Enabled',
                                                              transitions: [
                                                                { days: 90, storage_class: 'GLACIER' },
                                                                { days: 450, storage_class: 'DEEP_ARCHIVE' }
                                                              ]
                                                            }
                                                          ]
                                                        }
                                                      })