Remove namespacing of release_level_backup property

[flangewad]

[#151210351]

• A short explanation of the proposed change:
  We discovered that the convention is not to namespace new job-level properties with the job name, so we are modifying the property we added in a previous pull request (from tinygrasshopper)

• Links to any other associated PRs
  Added bbr scripts for the blobstore #56 <- original pull request, recently merged

• I have viewed signed and have submitted the Contributor License Agreement

• I have made this pull request to the develop branch

• I have run CF Acceptance Tests on bosh lite

[cfdreddbot]

Hey flangewad!

Thanks for submitting this pull request!

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[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/151439723

The labels on this github issue will be updated when the story is started.

[zrob]

triggering CLA checker

[cfdreddbot]

Hey flangewad!

Thanks for submitting this pull request! I'm here to inform the recipients of the pull request that you and the commit authors have already signed the CLA.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/151536918

The labels on this github issue will be updated when the story is started.

[elenasharma]

Merged!