Clean up sbt

- Restore MAINTAINER label for our Docker image
- Remove left over NativePackager code
- Remove references to jdeb and associated workaround
- Remove sbt-in-sbt loading of Coursier (this causes an issue, see sbt/sbt-native-packager#1053 (comment))
- Sync sbt-in-sbt version

build.sbt

@@ -222,7 +222,7 @@ lazy val `plugin-interface` = (project in file("plugin-interface"))
     )
 
 lazy val marathon = (project in file("."))
-  .enablePlugins(GitBranchPrompt, JavaServerAppPackaging, DockerPlugin, DebianPlugin, RpmPlugin, JDebPackaging,
+  .enablePlugins(GitBranchPrompt, JavaServerAppPackaging, DockerPlugin,
     RamlGeneratorPlugin, BasicLintingPlugin, GitVersioning, TestWithCoveragePlugin)
   .dependsOn(`plugin-interface`)
   .settings(testSettings : _*)

project/plugins.sbt

@@ -27,7 +27,6 @@ libraryDependencies ++= Seq(
   "org.raml" % "raml-parser-2" % "1.0.3",
   "com.eed3si9n" %% "treehugger" % "0.4.3",
   "org.slf4j" % "slf4j-nop" % "1.7.25",
-  "org.vafer" % "jdeb" % "1.5" artifacts Artifact("jdeb", "jar", "jar"),
   "com.trueaccord.scalapb" %% "compilerplugin" % "0.6.6"
 )
 
@@ -39,6 +38,3 @@ scalaVersion := {
     case "1.0" => "2.12.4"
   }
 }
-
-// Needed for jdeb dependency of sbt-native-packager
-classpathTypes += "maven-plugin"

project/project/build.properties

@@ -1,2 +1,2 @@
 # ideally synchronized with ../build.properties. Enables sbt-in-sbt
-sbt.version=1.0.4
+sbt.version=1.1.0