ENG-4638: Remove stupid redundant check that crashes if you widen a pkey.
Add a single junit test case to execise this. More may be coming.
ENG-4639 allow vem use users without plaintext pass(w)@rd[5]
Merge pull request #489 from VoltDB/ENG-4639

ENG-4639 allow vem use users without plaintext pass(w)@rd[5]
Merge pull request #486 from VoltDB/ENG-4638-widenpk

Eng 4638 Make sure widening or shrinking a unique index works correctly