init: Adding support to import directories

Support added so init scripts can now import directories.

BUG: 22721249
Change-Id: I02b566bfb50ea84469f1ea0c6ad205435a1df286
TEST: Tested importing a folder on arm64 emulator
diff --git a/init/readme.txt b/init/readme.txt
index 4dda340..5a758d7 100644
--- a/init/readme.txt
+++ b/init/readme.txt
@@ -197,8 +197,11 @@
 ifup <interface>
    Bring the network interface <interface> online.
 
-import <filename>
+import <path>
    Parse an init config file, extending the current configuration.
+   If <path> is a directory, each file in the directory is parsed as
+   a config file. It is not recursive, nested directories will
+   not be parsed.
 
 insmod <path>
    Install the module at <path>