[REEF-1788] Add Visual Studio 2017 to AppVeyor
[REEF-1788] Add Visual Studio 2017 to AppVeyor

JIRA:
   [REEF-1788](https://issues.apache.org/jira/browse/REEF-1788)

Pull request:
  This closes #1298

markusweimer/reef,apache/incubator-reef,dougmsft/reef,markusweimer/reef,markusweimer/incubator-reef,jwang98052/reef,markusweimer/reef,shravanmn/reef,anupam128/reef,jwang98052/incubator-reef,motus/reef,dongjoon-hyun/reef,jwang98052/reef,anupam128/reef,shravanmn/reef,dongjoon-hyun/reef,markusweimer/reef,singlis/reef,motus/reef,jwang98052/reef,singlis/reef,dongjoon-hyun/reef,shravanmn/reef,apache/incubator-reef,markusweimer/reef,jwang98052/incubator-reef,dougmsft/reef,apache/incubator-reef,motus/reef,dongjoon-hyun/incubator-reef,apache/incubator-reef,dougmsft/reef,shravanmn/reef,singlis/reef,markusweimer/incubator-reef,jwang98052/incubator-reef,singlis/reef,dougmsft/reef,dongjoon-hyun/reef,motus/reef,anupam128/reef,apache/incubator-reef,jwang98052/reef,anupam128/reef,markusweimer/incubator-reef,anupam128/reef,jwang98052/reef,anupam128/reef,apache/reef,anupam128/reef,apache/reef,dongjoon-hyun/incubator-reef,dongjoon-hyun/incubator-reef,jwang98052/incubator-reef,dougmsft/reef,apache/incubator-reef,markusweimer/incubator-reef,dongjoon-hyun/incubator-reef,markusweimer/incubator-reef,markusweimer/reef,shravanmn/reef,singlis/reef,apache/reef,dongjoon-hyun/incubator-reef,dongjoon-hyun/reef,apache/reef,jwang98052/incubator-reef,markusweimer/incubator-reef,dongjoon-hyun/incubator-reef,jwang98052/reef,markusweimer/reef,motus/reef,apache/reef,dongjoon-hyun/incubator-reef,apache/incubator-reef,motus/reef,motus/reef,dongjoon-hyun/reef,jwang98052/reef,markusweimer/incubator-reef,dougmsft/reef,apache/reef,dongjoon-hyun/reef,jwang98052/incubator-reef,shravanmn/reef,shravanmn/reef,jwang98052/incubator-reef,singlis/reef,singlis/reef,dougmsft/reef,apache/reef