Merge dashpay#6077: test: functional tests for RPC getgovernanceinfo

3971613 feat: functional tests for RPC getgovernanceinfo (Konstantin Akimov)

Pull request description:

  ## Issue being fixed or feature implemented
  dashpay/dash-issues#63

  ## What was done?
  It adds functional test for `getgovernanceinfo`

  ## How Has This Been Tested?
  Run unit/functional tests

  Check output of `test/functional/test_runner.py -j20 --previous-releases --coverage --extended`
  ```
  Uncovered RPC commands:
    - cleardiscouraged
    - debug
    - getblockheaders
    - getmerkleblocks
    - getpoolinfo
    - voteraw
  ```

  ## Breaking Changes
  N/A

  ## Checklist:
  - [x] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [x] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone

ACKs for top commit:
  PastaPastaPasta:
    utACK 3971613

Tree-SHA512: f2d93db9068a707f2b33dd841b14f266db226fc5e907f19a49cf7a856b840f0c2c1f521c462996888933bb0ed636c288db12b1d36978c124cb536ea1ab9f3892

Author: PastaPastaPasta

test/functional/feature_governance.py

@@ -90,6 +90,15 @@ def have_trigger_for_height(self, sb_block_height):
         return count == len(self.nodes)
 
     def run_test(self):
+        governance_info = self.nodes[0].getgovernanceinfo()
+        assert_equal(governance_info['governanceminquorum'], 1)
+        assert_equal(governance_info['proposalfee'], 1)
+        assert_equal(governance_info['superblockcycle'], 20)
+        assert_equal(governance_info['superblockmaturitywindow'], 10)
+        assert_equal(governance_info['lastsuperblock'], 120)
+        assert_equal(governance_info['nextsuperblock'], governance_info['lastsuperblock'] + governance_info['superblockcycle'])
+        assert_equal(governance_info['governancebudget'], 1000)
+
         map_vote_outcomes = {
             0: "none",
             1: "yes",