Separate device functionality into plugins.

lib/roles/device/plugins/adb.js

@@ -0,0 +1,25 @@
+var syrup = require('syrup')
+
+var adbkit = require('adbkit')
+
+var logger = require('../../../util/logger')
+var promiseutil = require('../../../util/promiseutil')
+
+module.exports = syrup()
+  .define(function(options) {
+    var log = logger.createLogger('device:plugins:adb')
+    var adb = adbkit.createClient()
+
+    function ensureBootComplete() {
+      return promiseutil.periodicNotify(
+          adb.waitBootComplete(options.serial)
+        , 1000
+        )
+        .progressed(function() {
+          log.info('Waiting for boot to complete')
+        })
+    }
+
+    return ensureBootComplete()
+      .return(adb)
+  })