Adding required System.Runtime dependency for test solutions

Author: JunTaoLuo

misc/ApplicationHostTestProjects/src/CompilationException/project.json

@@ -3,6 +3,7 @@
     "dnx451": { },
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   }

misc/DependencyTargets/src/A/project.json

@@ -11,6 +11,7 @@
         "dnx451": { },
         "dnxcore50": {
             "dependencies": {
+                "System.Runtime": "4.1.0-*"
             }
         }
     }

misc/DependencyTargets/src/B/project.json

@@ -11,6 +11,7 @@
         "dnx451": { },
         "dnxcore50": {
             "dependencies": {
+                "System.Runtime": "4.1.0-*"
             }
         }
     }

misc/DllImportTestProjects/src/NativeLib/project.json

@@ -5,6 +5,7 @@
       "dnx451": {},
       "dnxcore50": {
         "dependencies": {
+          "System.Runtime": "4.1.0-*"
         }
       }
   },

misc/DthTestProjects/src/EmptyLibrary/project.json

@@ -3,6 +3,7 @@
   "frameworks": {
     "dnxcore50": {
       "dependencies":{
+        "System.Runtime": "4.1.0-*"
       }
     }
   }

misc/DthTestProjects/src/FailReleaseProject/project.json

@@ -2,6 +2,7 @@
   "frameworks": {
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   },

misc/PublishWithDependency/src/A/project.json

@@ -12,6 +12,7 @@
     },
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   }