providers: remove hypersh provider (#524)

Hyper.sh was shutdown on Jan 16, 2019.
https://blog.hyper.sh/close_hyper_sh.html

Signed-off-by: Paulo Pires <pjpires@gmail.com>

Gopkg.toml

@@ -41,18 +41,10 @@
   name = "github.com/google/uuid"
   version = "0.2.0"
 
-[[constraint]]
-  name = "github.com/hyperhq/hyper-api"
-  revision = "18c77d3f9fe0abebb41b45c12f383ecac46f4ff1"
-
 [[constraint]]
   name = "github.com/gorilla/mux"
   version = "1.6.0"
 
-[[constraint]]
-  name = "github.com/hyperhq/hypercli"
-  revision = "29217d318cab52815518a1126d57ca010de83e4d"
-
 [[constraint]]
   name = "github.com/Azure/azure-sdk-for-go"
   version = "21.1.0"
@@ -81,19 +73,6 @@
   name = "github.com/cpuguy83/strongerrors"
   version = "0.2.1"
 
-# These are required for HyperHQ
-[[override]]
-  name = "github.com/xeipuuv/gojsonschema"
-  revision = "0c8571ac0ce161a5feb57375a9cdf148c98c0f70"
-
-[[override]]
-  name = "github.com/docker/libcompose"
-  version = "0.2.0"
-
-[[override]]
-  name = "github.com/hyperhq/libcompose"
-  revision = "15d3a105140f968f5d4f62d2f44afd22a24a98fb"
-
 [[constraint]]
   branch = "feature/wolfpack"
   name = "github.com/vmware/vic"