New command entry for acloud pull function

- Add new command for '$acloud pull'.
- Add args "--instance-name" to specify which instance to pull.

Bug: 120613398
Bug: 112274919
Test: acloud-dev pull
      acloud-dev pull --instance-name ins_name

Change-Id: I45e43a2a2a63dec3bae475fff57fde398e4cc915
diff --git a/Android.bp b/Android.bp
index 4d36801..3ff0421 100644
--- a/Android.bp
+++ b/Android.bp
@@ -46,6 +46,7 @@
         "acloud_reconnect",
         "acloud_internal",
         "acloud_list",
+        "acloud_pull",
         "acloud_metrics",
         "acloud_proto",
         "acloud_public",
@@ -79,9 +80,10 @@
     libs: [
         "acloud_create",
         "acloud_delete",
-	"acloud_reconnect",
+        "acloud_reconnect",
         "acloud_internal",
         "acloud_list",
+        "acloud_pull",
         "acloud_proto",
         "acloud_public",
         "acloud_setup",
@@ -177,6 +179,14 @@
 }
 
 python_library_host{
+    name: "acloud_pull",
+    defaults: ["acloud_default"],
+    srcs: [
+         "pull/*.py",
+    ],
+}
+
+python_library_host{
     name: "acloud_metrics",
     defaults: ["acloud_default"],
     srcs: [