allowing default content type for POST/DELETEs

fixes https://github.com/openstf/stf/issues/594

lib/units/api/swagger/api_v1.yaml

@@ -1,6 +1,6 @@
 swagger: "2.0"
 info:
-  version: "2.0.0"
+  version: "2.0.1"
   title: Smartphone Test Farm
   description: Control and manages real Smartphone devices from browser and restful apis
   license:
@@ -124,6 +124,8 @@ paths:
       summary: Delete User Device
       description: The User Devices endpoint will request for device release from stf server. It will return request accepted if device is being used by current user
       operationId: deleteUserDeviceBySerial
+      consumes:
+        - application/octet-stream
       tags:
         - user
       parameters:
@@ -149,6 +151,8 @@ paths:
       summary: Remote Connect
       description: The device connect endpoint will request stf server to connect remotely
       operationId: remoteConnectUserDeviceBySerial
+      consumes:
+        - application/octet-stream
       tags:
         - user
       parameters:
@@ -172,6 +176,8 @@ paths:
       summary: Remote Disconnect
       description: The device connect endpoint will request stf server to disconnect remotely
       operationId: remoteDisconnectUserDeviceBySerial
+      consumes:
+        - application/octet-stream
       tags:
         - user
       parameters: