Remove dockerfile/ prefix from openjdk images (#880)

Author: NeQuissimus

src/sbt-test/docker/override-commands/build.sbt

@@ -9,7 +9,7 @@ version := "0.1.0"
 maintainer := "Gary Coady <[email protected]>"
 
 dockerCommands := Seq(
-  Cmd("FROM", "dockerfile/openjdk:latest"),
+  Cmd("FROM", "openjdk:latest"),
   Cmd("MAINTAINER", maintainer.value),
   ExecCmd("CMD", "echo", "Hello, World from Docker")
 )

src/sphinx/formats/docker.rst

@@ -166,7 +166,7 @@ Docker Base Image
 
 .. code-block:: scala
 
-    dockerBaseImage := "dockerfile/openjdk"
+    dockerBaseImage := "openjdk"
 
 Docker Repository
 ~~~~~~~~~~~~~~~~~
@@ -210,7 +210,7 @@ In your sbt console type
 .. code-block:: bash
 
     > show dockerCommands
-    [info] List(Cmd(FROM,dockerfile/openjdk:latest), Cmd(MAINTAINER,Your Name <[email protected]>), ...)
+    [info] List(Cmd(FROM,openjdk:latest), Cmd(MAINTAINER,Your Name <[email protected]>), ...)
 
 
 
@@ -278,7 +278,7 @@ Now let's start adding some Docker commands.
   import com.typesafe.sbt.packager.docker._
 
   dockerCommands := Seq(
-    Cmd("FROM", "dockerfile/openjdk:latest"),
+    Cmd("FROM", "openjdk:latest"),
     Cmd("MAINTAINER", maintainer.value),
     ExecCmd("CMD", "echo", "Hello, World from Docker")
   )