Add UpdateRestrictions property to specify update type

Add a new property to UpdateRestrictionsType to specify whether the service supports PATCH or PUT. If not specified, PATCH Should be supported and PUT May be supported. <Property Name= "UpdateMethod" Type= "Capabilities.HttpMethod" Nullable= "true" > <Annotation Term= "Core.Description" String= "Supported HTTP Methods (PUT or PATCH) for updating an entity. If null, PATCH SHOULD be supported and PUT MAY be supported." /> </Property> <EnumType Name= "HttpMethod" IsFlags= "true" > <Member Name= "GET" Value = "1" > <Annotation Term= "Core.Description" String= "The HTTP GET Method" /> </Member> <Member Name= "PATCH" Value = "2" > <Annotation Term= "Core.Description" String= "The HTTP PATCH Method" /> </Member> <Member Name= "PUT" Value = "4" > <Annotation Term= "Core.Description" String= "The HTTP PUT Method" /> </Member> <Member Name= "POST" Value = "8" > <Annotation Term= "Core.Description" String= "The HTTP POST Method" /> </Member> <Member Name= "DELETE" Value = "16" > <Annotation Term= "Core.Description" String= "The HTTP DELETE Method" /> </Member> <Member Name= "OPTIONS" Value = "32" > <Annotation Term= "Core.Description" String= "The HTTP OPTIONS Method" /> </Member> <Member Name= "HEAD" Value = "64" > <Annotation Term= "Core.Description" String= "The HTTP OPTIONS Method" /> </Member> </EnumType>