Add support for uts attribute in service definition

Signed-off-by: Laura Brehm <[email protected]>

Author: laurazard

loader/full-example.yml

@@ -182,6 +182,8 @@ services:
 
     ipc: host
 
+    uts: host
+
     # Mapping or list
     # Mapping values can be strings, numbers or null
     labels:

loader/full-struct_test.go

@@ -200,6 +200,7 @@ func services(workingDir, homeDir string) []types.ServiceConfig {
 			Hostname: "foo",
 			Image:    "redis",
 			Ipc:      "host",
+			Uts:      "host",
 			Labels: map[string]string{
 				"com.example.description": "Accounting webapp",
 				"com.example.number":      "42",
@@ -877,6 +878,7 @@ services:
         hard: 40000
       nproc: 65535
     user: someone
+    uts: host
     volumes:
     - type: volume
       target: /var/lib/mysql
@@ -1530,6 +1532,7 @@ func fullExampleJSON(workingDir, homeDir string) string {
         "nproc": 65535
       },
       "user": "someone",
+      "uts": "host",
       "volumes": [
         {
           "type": "volume",

schema/compose-spec.json

@@ -366,6 +366,7 @@
           }
         },
         "user": {"type": "string"},
+        "uts": {"type": "string"},
         "userns_mode": {"type": "string"},
         "volumes": {
           "type": "array",