mon: PaxosServices: don't ignore get_version(ver,bl) return value

get_version(version_t,bufferlist) can only return one of two values:
  -ENOENT iff the version doesn't exist
  zero iff it was successful

Any other value is incorrect.

Fixes: #4281

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>