Write functional system tests for inert exceptions

[4miners]

Expected behavior

Would be nice to have functional system tests for inert exceptions, scenario:

• add inert transactions of affected types to execptions (delegate registration, vote)
• push a block with those transactions
• check if behavior is as expected (transactions are not applied to mem_accounts and mem_round)
• forge until end of a round
• check if behavior is as expected:
  • vote column is updated properly (not affected by those transactions)
  • fees (not including affected transactions) are split correctly to forging delegates (rounds_fees table on 0.9.x, rounds_rewards table on 1.0.0)

Actual behavior

We don't have tests. 😢

Steps to reproduce

N/A

Which version(s) does this affect? (Environment, OS, etc...)

0.9.14, after backporting 0.9.14 also 1.0.0