regenerate C# related files after backporting from master

src/csharp/Grpc.Auth/project.json

 {
-  "version": "1.1.0-dev",
+  "version": "1.0.1-pre1",
   "title": "gRPC C# Auth",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
@@ -22,7 +22,7 @@
     }
   },
   "dependencies": {
-    "Grpc.Core": "1.1.0-dev",
+    "Grpc.Core": "1.0.1-pre1",
     "Google.Apis.Auth": "1.16.0"
   },
   "frameworks": {

src/csharp/Grpc.HealthCheck/project.json

 {
-  "version": "1.1.0-dev",
+  "version": "1.0.1-pre1",
   "title": "gRPC C# Healthchecking",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
@@ -22,7 +22,7 @@
     }
   },
   "dependencies": {
-    "Grpc.Core": "1.1.0-dev",
+    "Grpc.Core": "1.0.1-pre1",
     "Google.Protobuf": "3.0.0"
   },
   "frameworks": {

src/csharp/build_packages_dotnetcli.sh

@@ -64,7 +64,7 @@ dotnet pack --configuration Release Grpc.Core/project.json --output ../../artifa
 dotnet pack --configuration Release Grpc.Auth/project.json --output ../../artifacts
 dotnet pack --configuration Release Grpc.HealthCheck/project.json --output ../../artifacts
 
-nuget pack Grpc.nuspec -Version "1.1.0-dev" -OutputDirectory ../../artifacts
-nuget pack Grpc.Tools.nuspec -Version "1.1.0-dev" -OutputDirectory ../../artifacts
+nuget pack Grpc.nuspec -Version "1.0.1-pre1" -OutputDirectory ../../artifacts
+nuget pack Grpc.Tools.nuspec -Version "1.0.1-pre1" -OutputDirectory ../../artifacts
 
 (cd ../../artifacts && zip csharp_nugets_dotnetcli.zip *.nupkg)

tools/dockerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile

@@ -76,7 +76,7 @@ RUN apt-get update && apt-get install -y \
 # Install Python packages from PyPI
 RUN pip install pip --upgrade
 RUN pip install virtualenv
-RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.0.0a2 six==1.10.0
+RUN pip install futures==2.2.0 enum34==1.0.4 protobuf==3.0.0a2
 
 #================
 # C# dependencies