Use consistent address for mocknet

[Bushstar]

Summary

• This PR uses a fixed mocknet operator and owner masternode address for all networks. Otherwise mocknet will fail to run after the first time as the address changes was changing on each run, the first time the MN is created with a random operator and owner address, the second run the MN already exists but the randomly generated operator and owner address is different which causes an assert when trying to get the MN by operator.

Implications

• Storage

  • Database reindex required
  • Database reindex optional
  • Database reindex not required
  • None

• Consensus

  • Network upgrade required
  • Includes backward compatible changes
  • Includes consensus workarounds
  • Includes consensus refactors
  • None