Denomination bracket - DO NOT MERGE

[shivkumarsah]

Please review network denomination bracket which include the below features:

• There shall be an interface to configure prepaid top up amount with corresponding validity.
• Top up amount value should define range, say 1-10ps, 10-50 ps. Ranges must be contiguous (no gaps between them), non-overlapping and exhaustive, such that every valid top-up amount can be assigned to exactly one denomination bracket.
• Validity should be in number of days.
• Any amount range can be mapped to any number of days.
• User can delete the already set range mapping with validity and can define the new mapping.
• User can delete the validity period for specific range and set new range

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@shivkumarsah updated the pull request - view changes

[shivkumarsah]

To vacuum subscriber balances after validity_days, we have created another PR #42

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@kkroo has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.