Samuel Merritt d42a78a3aa Basic ring builder validation.
This prevents people from creating bogus ring builder files.

Example: "swift-ring-builder object.builder create 33 0.9 -4".

Fixes bug 924577.

Change-Id: I7bfc04f7fa5f55f70a4eaae96c414f6b2872e283
2013-03-18 09:50:45 -07:00
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