politeiavoter: Migrate to new APIs.

[amass01]

Closes #1394.

[amass01]

_vote calls _summary which calls the old api to get proposal vote summary:

https://github.com/amassarwi/politeia/blob/pivoterinv/politeiawww/cmd/politeiavoter/politeiavoter.go#L972

I would like to change this one in this PR as well.

[amass01]

Done, I've migrated the vote summaries call to call new API - see c104866, as result looks like all commands are now migrated and using the new APIs.

Edit: One last todo https://github.com/decred/politeia/pull/1415/files#diff-9378a7dcd7429979890a5291a4310bab03060eadaf93e97974450ec07b83bd75R1504 - verify commands calls the vote results route and now it needs to call version and get the server pub key before in order to verify the response.

[amass01]

@lukebp updated.

To test, I voted no on a proposal; I see the votes count when calling tally, but when calling verify I see 0 successful votes, shouldn't it be 4 in that case?

Update: Apparently for the verify to pick the success votes, man need to vote with the trickle mode on, in that case
the successful votes will be json logged to the vote data dir, only then the verify command would be able to pick the success votes json and verify then against the vote results.

[amass01]

$ politeiavoter verify 96036609262e5051 --politeiawww "https://localhost:4443" --skipverify
== Checking vote 96036609262e5051
  Total votes       : 2
  Successful votes  : 2
  Unsuccessful votes: 0
== NO failed votes on proposal 96036609262e5051

[lukebp]

Tested and everything is working as expected. Just need to fix a few nits.

[amass01]

@lukebp Addressed.

[amass01]

@lukebp updated

[lukebp]

tACK

@marcopeereboom will want to ok this.