[autotest] Delete Android provisioning support.

This deletes support for provisioning Android DUTs in the test lab.

BUG=chromium:834335
TEST=sanity suite in local instance

Change-Id: I7e0404cd0efd3f664514b7f24c81cd02f4f6b2b5
Reviewed-on: https://chromium-review.googlesource.com/1036660
Commit-Ready: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
Reviewed-by: Jacob Kopczynski <jkop@chromium.org>
diff --git a/server/site_utils.py b/server/site_utils.py
index 15d7225..71e3150 100644
--- a/server/site_utils.py
+++ b/server/site_utils.py
@@ -191,11 +191,10 @@
              were multiple build labels assigned to this host.
 
     """
-    for prefix in [provision.CROS_VERSION_PREFIX,
-                   provision.ANDROID_BUILD_VERSION_PREFIX]:
-        build = get_label_from_afe(hostname, prefix + ':', afe)
-        if build:
-            return build
+    prefix = provision.CROS_VERSION_PREFIX
+    build = get_label_from_afe(hostname, prefix + ':', afe)
+    if build:
+        return build
     return None