avocado.utils: Add aexpect library

Add aexpect, a near exact copy of the code that
has been used by virt-test for a long time. It
is a library for controlling interactive process,
similar to pexpect, but with some additional
properties:

* Programs may stay alive between tests and jobs
* More sophisticated class structure

Signed-off-by: Lucas Menghel Rodrigues

avocado/__init__.py

@@ -12,6 +12,7 @@
 # Copyright: Red Hat Inc. 2013-2014
 # Author: Lucas Meneghel Rodrigues <lmr@redhat.com>
 
+import aexpect
 import cli
 import core
 

avocado/utils/__init__.py

@@ -13,6 +13,8 @@
 # Author: Lucas Meneghel Rodrigues <lmr@redhat.com>
 
 import archive
+import astring
+import aurl
 import build
 import crypto
 import download
@@ -23,3 +25,4 @@ import params
 import process
 import remote
 import virt
+import wait