Separate device functionality into plugins.

lib/roles/device/plugins/identity.js

@@ -0,0 +1,20 @@
+var syrup = require('syrup')
+
+var devutil = require('../../../util/devutil')
+var logger = require('../../../util/logger')
+
+module.exports = syrup()
+  .dependency(require('./adb'))
+  .define(function(options, adb) {
+    var log = logger.createLogger('device:plugins:identity')
+
+    function solve() {
+      log.info('Solving identity')
+      return adb.getProperties(options.serial)
+        .then(function(properties) {
+          return devutil.makeIdentity(options.serial, properties)
+        })
+    }
+
+    return solve()
+  })