Fix random RPC tests failing

[aguycalled]

This PR fixes a few RPC tests which were randomly failing.

[mxaddict]

Looks like coldstaking_fee.py is failing on this PR

[aguycalled]

included fix for coldstaking_fee.py

[mxaddict]

Changes make sense, build passes

[chasingkirkjufell]

one test failed.

stakingaddress.py:
Initializing test directory /tmp/test09ema07u/6
Restart node with staking address option ...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
waiting for a new block...
Assertion failed: 0E-8 != 2
Stopping nodes
Not cleaning up dir /tmp/test09ema07u/6
Failed

stderr:
File "/home/cluster/navcoin-core/qa/rpc-tests/test_framework/test_framework.py", line 149, in main
self.run_test()
File "/home/cluster/navcoin-core/qa/rpc-tests/stakingaddress.py", line 42, in run_test
assert_equal(self.nodes[0].gettransaction(stake_tx)["details"][0]["amount"], 2)
File "/home/cluster/navcoin-core/qa/rpc-tests/test_framework/util.py", line 507, in assert_equal
raise AssertionError("%s != %s"%(str(thing1),str(thing2)))

Pass: False, Duration: 79 s

[aguycalled]

@chasingkirkjufell i think you are running the tests from other branch. line 42 has been changed in this pr

[chasingkirkjufell]

You are right, that's a little weird though. Testing the correct branch now.

[chasingkirkjufell]

tested the tests 5-10x each and all passed.

[chasingkirkjufell]

misclicked