Adding support for --memory-swap and --memory-swappiness flags

Only requires changing the API at swarmkit's level. Rest of the changes
will be in a moby/moby PR.

Author: wk8

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"
       }
@@ -2639,8 +2639,8 @@ file {
       type: TYPE_MESSAGE
       type_name: ".google.protobuf.Duration"
       options {
-        65011: 1
         65001: 0
+        65011: 1
       }
       json_name: "delay"
     }
@@ -3083,8 +3083,8 @@ file {
         }
       }
       options {
-        62023: "PublishMode"
         62001: 0
+        62023: "PublishMode"
       }
     }
   }
@@ -3783,8 +3783,8 @@ file {
       label: LABEL_OPTIONAL
       type: TYPE_UINT32
       options {
-        65003: "os.FileMode"
         65001: 0
+        65003: "os.FileMode"
       }
       json_name: "mode"
     }
@@ -4200,8 +4200,8 @@ file {
       }
     }
     options {
-      62023: "NodeRole"
       62001: 0
+      62023: "NodeRole"
     }
   }
   syntax: "proto3"
@@ -4869,6 +4869,21 @@ 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 {
@@ -8051,8 +8066,8 @@ file {
       type: TYPE_MESSAGE
       type_name: ".google.protobuf.Duration"
       options {
-        65011: 1
         65001: 0
+        65011: 1
       }
       json_name: "period"
     }
@@ -9099,11 +9114,11 @@ file {
     }
   }
   options {
-    63017: 1
-    63020: 1
-    63018: 1
     63001: 0
     63002: 0
+    63017: 1
+    63018: 1
+    63020: 1
   }
 }
 file {