Log server commands

Prior to this change, if a network command came in, it would run in the
background with no real feedback in the server ui. Prior to this change,
running compile from the thin client would look like:

sbt:scala-compile>
[success] Total time: 1 s, completed Dec 12, 2019, 7:24:43 PM
sbt:scala-compile>

Now it looks like:
sbt:scala-compile>
[info] Running remote command: compile
[success] Total time: 1 s, completed Dec 12, 2019, 7:26:17 PM
sbt:scala-compile>

main/src/main/scala/sbt/Main.scala

@@ -900,6 +900,9 @@ object BuiltinCommands {
       .getOpt(Keys.minForcegcInterval)
       .getOrElse(GCUtil.defaultMinForcegcInterval)
     val exec: Exec = exchange.blockUntilNextExec(minGCInterval, s1.globalLogging.full)
+    if (exec.source.fold(true)(_.channelName != "console0")) {
+      s1.log.info(s"Running remote command: ${exec.commandLine}")
+    }
     val newState = s1
       .copy(
         onFailure = Some(Exec(Shell, None)),