Update Python worker imports to use proper paths (#39)

Author: maiqbal11

src/proto/FunctionRpc.proto

@@ -10,8 +10,8 @@ option go_package ="github.com/Azure/azure-functions-go-worker/internal/rpc";
 package AzureFunctionsRpcMessages;
 
 import "google/protobuf/duration.proto";
-import "identity/ClaimsIdentityRpc.proto";
-import "shared/NullableTypes.proto";
+import "azure_functions_worker/protos/ClaimsIdentityRpc.proto";
+import "azure_functions_worker/protos/NullableTypes.proto";
 
 // Interface exported by the server.
 service FunctionRpc {

src/proto/identity/ClaimsIdentityRpc.proto

@@ -3,7 +3,7 @@ syntax = "proto3";
 
 option java_package = "com.microsoft.azure.functions.rpc.messages";
 
-import "shared/NullableTypes.proto";
+import "azure_functions_worker/protos/NullableTypes.proto";
 
 // Light-weight representation of a .NET System.Security.Claims.ClaimsIdentity object.
 // This is the same serialization as found in EasyAuth, and needs to be kept in sync with