Change statusMessage property to wildcard type. (#2486)

The statusMessage can be a string or a JSON object, so model it as a
wildcard type.

Author: jhendrixMSFT

specification/resources/resource-manager/Microsoft.Resources/stable/2015-11-01/resources.json

@@ -2763,7 +2763,6 @@
           "description": "Gets or sets operation status code."
         },
         "statusMessage": {
-          "type": "object",
           "description": "Gets or sets operation status message."
         },
         "targetResource": {

specification/resources/resource-manager/Microsoft.Resources/stable/2016-02-01/resources.json

@@ -2402,7 +2402,6 @@
           "description": "Operation status code."
         },
         "statusMessage": {
-          "type": "object",
           "description": "Operation status message."
         },
         "targetResource": {

specification/resources/resource-manager/Microsoft.Resources/stable/2016-07-01/resources.json

@@ -2411,7 +2411,6 @@
           "description": "Operation status code."
         },
         "statusMessage": {
-          "type": "object",
           "description": "Operation status message."
         },
         "targetResource": {

specification/resources/resource-manager/Microsoft.Resources/stable/2016-09-01/resources.json

@@ -2664,7 +2664,6 @@
         },
         "statusMessage": {
           "readOnly": true,
-          "type": "object",
           "description": "Operation status message."
         },
         "targetResource": {

specification/resources/resource-manager/Microsoft.Resources/stable/2017-05-10/resources.json

@@ -2743,7 +2743,6 @@
         },
         "statusMessage": {
           "readOnly": true,
-          "type": "object",
           "description": "Operation status message."
         },
         "targetResource": {