Adding a Dockerfile and making it easy to use it for dev

Credit goes to dperny (moby#2687)

**- What I did**

Adds a Dockerfile for the swarmkit project, to easily get off the ground. Modifies the Makefile to make intelligent use of Docker.

Also made small clean up changes to the Makefile.

**- How I did it**

Modifies the Makefile to have two paths: containerized.mk, which builds the docker image and forwards any make targets to a container, and direct.mk, which encompasses the old Makefile's workflow.

By default, nothing will run inside a container. Set the environment variable `DOCKER_SWARMKIT_USE_CONTAINER` to use dockerized making.

Also leverages docker-sync for synchronizing code to the container if the `DOCKER_SWARMKIT_USE_DOCKER_SYNC` env variable is set; comes in handy on Macs, for example.

**- How to test it**

Set `DOCKER_SWARMKIT_USE_CONTAINER` and verify that your favorite make targets all work!

Signed-off-by: Jean Rouge <jer329@cornell.edu>

api/api.pb.txt

@@ -2491,8 +2491,8 @@ file {
         label: LABEL_OPTIONAL
         type: TYPE_UINT32
         options {
-          65003: "os.FileMode"
           65001: 0
+          65003: "os.FileMode"
         }
         json_name: "mode"
       }
@@ -2646,8 +2646,8 @@ file {
       type: TYPE_MESSAGE
       type_name: ".google.protobuf.Duration"
       options {
-        65011: 1
         65001: 0
+        65011: 1
       }
       json_name: "delay"
     }
@@ -3090,8 +3090,8 @@ file {
         }
       }
       options {
-        62023: "PublishMode"
         62001: 0
+        62023: "PublishMode"
       }
     }
   }
@@ -3790,8 +3790,8 @@ file {
       label: LABEL_OPTIONAL
       type: TYPE_UINT32
       options {
-        65003: "os.FileMode"
         65001: 0
+        65003: "os.FileMode"
       }
       json_name: "mode"
     }
@@ -4207,8 +4207,8 @@ file {
       }
     }
     options {
-      62023: "NodeRole"
       62001: 0
+      62023: "NodeRole"
     }
   }
   syntax: "proto3"
@@ -4876,6 +4876,21 @@ file {
       type_name: ".docker.swarmkit.v1.ContainerSpec.SysctlsEntry"
       json_name: "sysctls"
     }
+    field {
+      name: "memory_swap"
+      number: 27
+      label: LABEL_OPTIONAL
+      type: TYPE_INT64
+      json_name: "memorySwap"
+    }
+    field {
+      name: "memory_swappiness"
+      number: 28
+      label: LABEL_OPTIONAL
+      type: TYPE_MESSAGE
+      type_name: ".google.protobuf.Int64Value"
+      json_name: "memorySwappiness"
+    }
     nested_type {
       name: "LabelsEntry"
       field {
@@ -8058,8 +8073,8 @@ file {
       type: TYPE_MESSAGE
       type_name: ".google.protobuf.Duration"
       options {
-        65011: 1
         65001: 0
+        65011: 1
       }
       json_name: "period"
     }
@@ -9106,11 +9121,11 @@ file {
     }
   }
   options {
-    63017: 1
-    63020: 1
-    63018: 1
     63001: 0
     63002: 0
+    63017: 1
+    63018: 1
+    63020: 1
   }
 }
 file {

api/deepcopy/copy.go

@@ -47,6 +47,9 @@ func Copy(dst, src interface{}) {
 	case *types.BoolValue:
 		src := src.(*types.BoolValue)
 		*dst = *src
+	case *types.Int64Value:
+		src := src.(*types.Int64Value)
+		*dst = *src
 	case CopierFrom:
 		dst.CopyFrom(src)
 	default: