ACCUMULO-2093 Exclude incomplete tables from listing.

  Specifically, tables who can't resolve with a fully-qualified table
  name are excluded from a table listing. This ensures that tables being
  created and/or deleted aren't shown in an inconsistent state.
ACCUMULO-2094 Consolidate namespaceId addition with creating table

  Also clean up related initialize and upgrade code, and consolidate
  duplicate code.
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